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--- a/README.md
+++ b/README.md
@@ -4,4 +4,1176 @@
 
 > Curated collection of useful React snippets that you can understand in 30 seconds or less.
 
-**This repository is a work in progress. If you want to contribute, please check the open issues to see where and how you can help out!**
+#### Related projects
+
+* [30 Seconds of Code](https://30secondsofcode.org)
+* [30 Seconds of CSS](https://30-seconds.github.io/30-seconds-of-css/)
+* [30 Seconds of Interviews](https://30secondsofinterviews.org/)
+
+## Table of Contents
+
+
+### Array
+
+<details>
+<summary>View contents</summary>
+
+* [DataList](#datalist)
+* [DataTable](#datatable)
+* [MappedTable](#mappedtable)
+</details>
+
+
+### Input
+
+<details>
+<summary>View contents</summary>
+
+* [Input](#input)
+* [LimitedTextarea](#limitedtextarea)
+* [PasswordRevealer](#passwordrevealer)
+* [Select](#select)
+* [TextArea](#textarea)
+</details>
+
+
+### String
+
+<details>
+<summary>View contents</summary>
+
+* [AutoLink](#autolink)
+</details>
+
+
+### Visual
+
+<details>
+<summary>View contents</summary>
+
+* [Carousel](#carousel)
+* [Collapse](#collapse)
+* [Mailto](#mailto)
+* [ModalDialog](#modaldialog)
+* [StarRating](#starrating)
+* [Tab](#tab)
+* [Ticker](#ticker)
+* [Toggle](#toggle)
+* [Tooltip](#tooltip)
+</details>
+
+
+---
+
+## Array
+### DataList
+
+Renders a list of elements from an array of primitives.
+
+Use the value of the `isOrdered` prop to conditionally render a `<ol>` or `<ul>` list.
+Use `Array.prototype.map` to render every item in `data` as a `<li>` element, give it a `key` produced from the concatenation of the its index and value.
+Omit the `isOrdered` prop to render a `<ul>` list by default.
+
+```jsx
+function DataList({ isOrdered, data }) {
+  const list = data.map((val, i) => (
+    <li key={`${i}_${val}`}>{val}</li>
+  ));
+  return isOrdered ? <ol>{list}</ol> : <ul>{list}</ul>;
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+const names = ['John', 'Paul', 'Mary'];
+ReactDOM.render(<DataList data={names}/>, document.getElementById('root'));
+ReactDOM.render(<DataList data={names} isOrdered/>, document.getElementById('root'));
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### DataTable
+
+Renders a table with rows dynamically created from an array of primitives.
+
+Render a `<table>` element with two columns (`ID` and `Value`).
+Use `Array.prototype.map` to render every item in `data` as a `<tr>` element, consisting of its index and value, give it a `key` produced from the concatenation of the two.
+
+```jsx
+function DataTable({ data }) {
+  return (
+    <table>
+      <thead>
+        <tr>
+          <th>ID</th>
+          <th>Value</th>
+        </tr>
+      </thead>
+      <tbody>
+        {data.map((val, i) =>
+          <tr key={`${i}_${val}`}>
+            <td>{i}</td>
+            <td>{val}</td>
+          </tr>
+        )}
+      </tbody>
+    </table>
+  );
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+const people = ['John', 'Jesse'];
+ReactDOM.render(
+  <DataTable data={people} />,
+  document.getElementById('root')
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### MappedTable
+
+Renders a table with rows dynamically created from an array of objects and a list of property names.
+
+Use `Object.keys()`, `Array.prototype.filter()`, `Array.prototype.includes()` and `Array.prototype.reduce()` to produce a `filteredData` array, containing all objects with the keys specified in `propertyNames`.
+Render a `<table>` element with a set of columns equal to the amount of values in `propertyNames`.
+Use `Array.prototype.map` to render each value in the `propertyNames` array as a `<th>` element.
+Use `Array.prototype.map` to render each object in the `filteredData` array as a `<tr>` element, containing a `<td>` for each key in the object.
+
+```jsx
+function MappedTable({ data, propertyNames }) {
+  let filteredData = data.map(v =>
+    Object.keys(v)
+      .filter(k => propertyNames.includes(k))
+      .reduce((acc, key) => ((acc[key] = v[key]), acc), {})
+  );
+  return (
+    <table>
+      <thead>
+        <tr>{propertyNames.map(val => <th key={`h_${val}`}>{val}</th>)}</tr>
+      </thead>
+      <tbody>
+        {filteredData.map((val, i) => (
+          <tr key={`i_${i}`}>
+            {propertyNames.map(p => <td key={`i_${i}_${p}`}>{val[p]}</td>)}
+          </tr>
+        ))}
+      </tbody>
+    </table>
+  );
+}
+```
+#### Notes
+
+This component does not work with nested objects and will break if there are nested objects inside any of the properties specified in `propertyNames`.,<!-tags: array,object,functional -->,<!-expertise: 1 -->
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+const people = [
+  { name: 'John', surname: 'Smith', age: 42 },
+  { name: 'Adam', surname: 'Smith', gender: 'male' }
+];
+const propertyNames = ['name', 'surname', 'age'];
+ReactDOM.render(
+  <MappedTable data={people} propertyNames={propertyNames} />,
+  document.getElementById('root')
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+## Input
+### Input
+
+Renders an `<input>` element that uses a callback function to pass its value to the parent component.
+
+Use object destructuring to set defaults for certain attributes of the `<input>` element.
+Render an `<input>` element with the appropriate attributes and use the `callback` function in the `onChange` event to pass the value of the input to the parent.
+
+```jsx
+function Input ({ callback, type = 'text', disabled = false, readOnly = false, placeholder = '' }) {
+  return (
+    <input
+      type={type}
+      disabled={disabled}
+      readOnly={readOnly}
+      placeholder={placeholder}
+      onChange={({ target: { value } }) => callback(value)}
+    />
+  );
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(
+  <Input type='text' placeholder='Insert some text here...' callback={(val) => console.log(val)}/>,
+  document.getElementById('root')
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### LimitedTextarea
+
+Renders a textarea component with a character limit.
+
+Use the value of the `value` prop to determine the initial `state.content` and `state.characterCount` and the value of the `limit` props to determine the value of `state.limit`.
+Create a method, `handleChange`, which trims the `event.target.value` data if necessary and uses `Component.prototype.setState` to update `state.content` and `state.characterCount`, and bind it to the component's context.
+In the`render()` method, use a`<div>` to wrap both the`<textarea>` and the `<p>` element that displays the character count and bind the `onChange` event of the `<textarea>` to the `handleChange` method.
+
+```jsx
+class LimitedTextarea extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      content: props.value,
+      characterCount: props.value.length,
+      limit: props.limit
+    };
+    this.handleChange = this.handleChange.bind(this);
+  }
+  
+  handleChange(event) {
+    let newContent = event.target.value;
+    if(newContent.length >= this.state.limit) newContent = newContent.slice(0, this.state.limit);
+    this.setState(state => ({ content: newContent, characterCount: newContent.length }));
+  }
+  render() {
+    return (
+      <div>
+        <textarea 
+          rows={this.props.rows} 
+          cols={this.props.cols} 
+          onChange={this.handleChange} 
+          value={this.state.content}
+        >
+        </textarea>
+        <p>{this.state.characterCount}/{this.props.limit}</p>
+      </div>
+    );
+  }
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(
+  <LimitedTextarea limit={32} value='Hello!' />,
+  document.getElementById('root')
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### PasswordRevealer
+
+Renders a password input field with a reveal button.
+
+Initially set `state.shown` to `false` to ensure that the password is not shown by default.
+Create a method, `toggleShown`, which uses `Component.prototype.setState` to change the input's state from shown to hidden and vice versa, bind it to the component's context.
+In the`render()` method, use a`<div>` to wrap both the`<input>` and the `<button>` element that toggles the type of the input field.
+Finally, bind the `<button>`'s `onClick` event to the `toggleShown` method.
+
+```jsx
+class PasswordRevealer extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      shown: false
+    };
+    this.toggleShown = this.toggleShown.bind(this);
+  }
+
+  toggleShown() {
+    this.setState(state => ({ shown: !state.shown }));
+  }
+
+  render() {
+    return (
+      <div>
+        <input
+          type={this.state.shown ? 'text' : 'password'}
+          value={this.props.value}
+        />
+        <button onClick={this.toggleShown}>Show/Hide</button>
+      </div>
+    );
+  }
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(<PasswordRevealer />, document.getElementById('root'));
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Select
+
+Renders a `<select>` element that uses a callback function to pass its value to the parent component.
+
+Use object destructuring to set defaults for certain attributes of the `<select>` element.
+Render a `<select>` element with the appropriate attributes and use the `callback` function in the `onChange` event to pass the value of the textarea to the parent.
+Use destructuring on the `values` array to pass an array of `value` and  `text` elements and the `selected` attribute to define the initial `value` of the `<select>` element.
+
+```jsx
+function Select ({ values, callback, disabled = false, readonly = false, selected }) {
+  return (
+    <select
+      disabled={disabled}
+      readOnly={readonly}
+      onChange={({ target : { value } }) => callback(value)}
+    >
+      {values.map(([value, text]) => <option selected={selected === value}value={value}>{text}</option>)}
+    </select>
+  );
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+let choices = [
+  ['grapefruit', 'Grapefruit'],
+  ['lime', 'Lime'],
+  ['coconut', 'Coconut'],
+  ['mango', 'Mango']
+];
+ReactDOM.render(
+  <Select values={choices} selected='lime' callback={(val) => console.log(val)}/>,
+  document.getElementById('root')
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### TextArea
+
+Renders a `<textarea>` element that uses a callback function to pass its value to the parent component.
+
+Use object destructuring to set defaults for certain attributes of the `<textarea>` element.
+Render a `<textarea>` element with the appropriate attributes and use the `callback` function in the `onChange` event to pass the value of the textarea to the parent.
+
+```jsx
+function TextArea ({ callback, cols = 20, rows = 2, disabled = false, readOnly = false, placeholder='' }) {
+  return (
+    <textarea
+      cols={cols}
+      rows={rows}
+      disabled={disabled}
+      readOnly={readOnly}
+      placeholder={placeholder}
+      onChange={({ target : { value } }) => callback(value)}
+    />
+  );
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(
+  <TextArea placeholder='Insert some text here...' callback={(val) => console.log(val)}/>,
+  document.getElementById('root')
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+## String
+### AutoLink
+
+Renders a string as plaintext, with URLs converted to appropriate `<a>` elements.
+
+Use `String.prototype.split()` and `String.prototype.match()` with a regular expression to find URLs in a string.
+Return a  `<React.Fragment>` with matched URLs rendered as `<a>` elements, dealing with missing protocol prefixes if necessary, and the rest of the string rendered as plaintext.
+
+```jsx
+function AutoLink({ text }) {
+  const delimiter = /((?:https?:\/\/)?(?:(?:[a-z0-9]?(?:[a-z0-9\-]{1,61}[a-z0-9])?\.[^\.|\s])+[a-z\.]*[a-z]+|(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3})(?::\d{1,5})*[a-z0-9.,_\/~#&=;%+?\-\\(\\)]*)/gi;
+
+  return (
+    <React.Fragment>
+      {text.split(delimiter).map(word => {
+        let match = word.match(delimiter);
+        if (match) {
+          let url = match[0];
+          return (
+            <a href={url.startsWith("http") ? url : `http://${url}`}>{url}</a>
+          );
+        }
+        return word;
+      })}
+    </React.Fragment>
+  );
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(
+  <AutoLink text='foo bar baz http://example.org bar' />,
+  document.getElementById('root')
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+## Visual
+### Carousel
+
+Renders a carousel component.
+
+Initially set `state.active` to `0` (index of the first item).
+Use an object, `style`, to hold the styles for the individual components.
+Define a method, `setActiveItem`, which uses `this.setState` to change the state's `active` property to the index of the next item.
+Define another method, `changeItem`, which is called by `setActiveItem` after updating the state each time and also when the component
+first renders (on `ComponentDidMount`).
+In the `render()` method, destructure `state`, `style` and `props`, compute if visibility style should be set to `visible` or not for each carousel item while mapping over and applying the combined style to the carousel item component accordingly.
+Render the carousel items using [React.cloneElement](https://reactjs.org/docs/react-api.html#cloneelement) and pass down rest
+`props` along with the computed styles.
+
+```jsx
+class Carousel extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      active: 0
+    };
+    this.scrollInterval = null;
+    this.style = {
+      carousel: {
+        position: "relative"
+      },
+      carouselItem: {
+        position: "absolute",
+        visibility: "hidden"
+      },
+      visible: {
+        visibility: "visible"
+      }
+    };
+  }
+  componentDidMount() {
+    this.changeItem();
+  }
+  setActiveItem = () => {
+    const { carouselItems } = this.props;
+    this.setState(
+      prevState => ({
+        active: (prevState.active + 1) % carouselItems.length
+      }),
+      this.changeItem
+    );
+  };
+  changeItem = () => {
+    this.scrollInterval = setTimeout(this.setActiveItem, 2000);
+  };
+  render() {
+    const { carouselItems, ...rest } = this.props;
+    const { active } = this.state;
+    const { visible, carousel, carouselItem } = this.style;
+    return (
+      <div style={carousel}>
+        {carouselItems.map((item, index) => {
+          const activeStyle = active === index ? visible : {};
+          return React.cloneElement(item, {
+            ...rest,
+            style: {
+              ...carouselItem,
+              ...activeStyle
+            }
+          });
+        })}
+      </div>
+    );
+  }
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(
+  <Carousel
+    carouselItems={[
+      <div>carousel item 1</div>,
+      <div>carousel item 2</div>,
+      <div>carousel item 3</div>
+    ]}
+  />,
+  document.getElementById("root")
+);
+ ```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Collapse
+
+Renders a component with collapsible content.
+
+Use the value of the `collapsed` prop to determine the initial state of the content (collapsed/expanded).
+Set the `state` of the component to the value of the `collapsed` prop (cast to a boolean value) and bind the `toggleCollapse` method to the component's context.
+Use an object, `style`, to hold the styles for individual components and their states.
+Create a method, `toggleCollapse`, which uses `Component.prototype.setState` to change the component's `state` from collapsed to expanded and vice versa.
+In the `render()` method, use a `<div>` to wrap both the `<button>` that alters the component's `state` and the content of the component, passed down via `props.children`.
+Determine the appearance of the content, based on `state.collapsed` and apply the appropriate CSS rules from the `style` object.
+Finally, update the value of the `aria-expanded` attribute based on `state.collapsed` to make the component accessible.
+
+```jsx
+class Collapse extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      collapsed: !!props.collapsed
+    };
+    this.style = {
+      collapsed: {
+        display: 'none'
+      },
+      expanded: {
+        display: 'block'
+      },
+      buttonStyle: {
+        display: 'block',
+        width: '100%'
+      }
+    };
+    this.toggleCollapse = this.toggleCollapse.bind(this);
+  }
+  
+  toggleCollapse() {
+    this.setState(state => ({ collapsed: !state.collapsed }));
+  }
+  
+  render() {
+    return (
+      <div>
+        <button style={this.style.buttonStyle} onClick={this.toggleCollapse}>
+          {this.state.collapsed ? 'Show' : 'Hide'} content
+        </button>
+        <div 
+          style= {this.state.collapsed ? this.style.collapsed : this.style.expanded} 
+          aria-expanded = {this.state.collapsed}
+        >
+          {this.props.children}
+        </div>
+      </div>
+    );
+  }
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(
+  <Collapse>
+    <h1>This is a collapse</h1>
+    <p>Hello world!</p>
+  </Collapse>,
+  document.getElementById('root')
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Mailto
+
+Renders a link formatted to send an email.
+
+Destructure the component's props, use `email`, `subject` and `body` to create a `<a>` element with an appropriate `href` attribute.
+Render the link with `props.children` as its content.
+
+```jsx
+function Mailto({ email, subject, body, ...props }) {
+  return (
+    <a href={`mailto:${email}?subject=${subject || ""}&body=${body || ""}`}>
+      {props.children}
+    </a>
+  );
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(
+  <Mailto email="foo@bar.baz" subject="Hello" body="Hello world!">
+    Mail me!
+  </Mailto>,
+  document.getElementById("root")
+);
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### ModalDialog
+
+Renders a dialog component in a modal, controllable through events. 
+To use the component, import `ModalDialog` only once and then display it using `ModalDialog.show()`, passing the JSX templates and data as parameters.
+
+Define `modalHandler`, a method that will handle showing the modal dialog, set `state` to the default values initially and bind the `close` and `modalClick` methods to the component's context.
+Define `close` and `modalClick` to toggle the visibility of the modal dialog, based on `state.closeOnClick`.
+Use the CustomEvent API to listen for `modal` events, that can be dispatched from the `static` `show()` method, handle listeners appropriately from `componentDidMount` and `componentWillUnmount`.
+
+The `show()` method accepts an argument, that should contain three parameters:
+* `title`, a string for the dialog's title
+* `closeOnClick`, `true` if the modal should close on click or `false` if it should only close when clicking the *X* button
+* `content`, which is the JSX content to be rendered inside the dialog
+
+Finally, in the `render()` method, use a `<div>` to wrap everything and render the modal dialog with the content passed to `show()`.
+
+```css
+  .modal {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background-color: rgba(0, 0, 0, 0.6);
+    z-index: 9998;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+  }
+  .dialog {
+    background-color: white;
+    border-radius: 5px;
+    overflow: hidden;
+  }
+  .dialog-title {
+    box-sizing: border-box;
+    width: 100%;
+    height: 48px;
+    padding: 0 16px;
+    border-bottom: 0.5px solid #c3c3c3;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+  }
+  .dialog-close {
+    font-size: 32px;
+    color: #c3c3c3;
+    cursor: pointer;
+    transform: rotate(45deg);
+    user-select: none;
+  }
+  .dialog-close:hover {
+    color: red;
+  }
+  .dialog-content {
+    min-width: 300px;
+  }
+```
+
+```jsx
+class ModalDialog extends React.Component {
+  constructor() {
+    super();
+    this.modalHandler = (e) => {
+      this.setState({
+        data: e.detail.data,
+        visible: true
+      });
+    };
+    this.state = {
+      data: {
+        title: '',
+        closeOnClick: false,
+        content: ''
+      },
+      visible: false
+    };
+    this.close = this.close.bind(this);
+    this.modalClick = this.modalClick.bind(this);
+  }
+  render() {
+    return !this.state.visible ? null : <div className="modal" onClick={this.modalClick}>
+      <div className="dialog">
+        <div className="dialog-title">{ this.state.data.title }<span className="dialog-close" onClick={this.close}>+</span></div>
+        <div className="dialog-content">
+          {
+            this.state.data.content
+          }
+        </div>
+      </div>
+    </div>
+  }
+  componentDidMount() {
+    document.addEventListener('modal', this.modalHandler);
+  }
+  componentWillUnmount() {
+    document.removeEventListener('modal', this.modalHandler);
+  }
+  close() {
+    this.setState({
+      visible: false,
+      data: {
+        title: '',
+        closeOnClick: false,
+        content: ''
+      }
+    });
+  }
+  static show(data) {
+    document.dispatchEvent(new CustomEvent('modal', {
+      detail: {
+        data
+      }
+    }));
+  }
+  modalClick() {
+    if (this.state.data.closeOnClick) this.close();
+  }
+}
+```
+#### Notes
+
+This component includes a lot of CSS, which might conflict with other CSS in your project. It is recomended for the modal to be a direct child of the body tag.,A more up-to-date method with lower compatibility is to use [Portals](https://reactjs.org/docs/portals.html) in React 16+.,<!-tags: visual,static,children,state,class -->,<!-expertise: 1 -->
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+// add to render function
+<ModalDialog />
+
+// every time you wanna call the dialog
+// content is a jsx element
+ModalDialog.show({
+  title: 'Hello, world!',
+  closeOnClick: true,
+  content: <img src="https://github.com/30-seconds/30-seconds-of-react/blob/master/logo.png"/>
+});  
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### StarRating
+
+Renders a star rating component.
+
+Use and IIFE to define a functional component, called `Star` that will render each individual star with the appropriate appearance, based on the parent component's `state` and return the class component `StarRating`.
+Use the value of the `rating` prop to determine if a valid rating is supplied and store it in `state.rating` (or `0` if invalid or not supplied).
+Initialize `state.selection` to `0`.
+Create two methods, `hoverOver` and `setRating`, that take an event as argument and update `state.selected` and `state.rating` according to it, bind them both to the component's context.
+In the `render()` method, create a `<div>` to wrap the `<Star>` components, which are created using `Array.prototype.map` on an array of 5 elements, created using `Array.from`, and handle the `onMouseLeave` event to set `state.selection` to `0`, the `onClick` event to set
+the `state.rating` and the `onMouseOver` event to set `state.selection` to the `star-id` attribute of the `event.target` respectively. 
+Finally, pass the appropriate values to each `<Star>` component (`starId` and `marked`).
+
+```jsx
+const StarRating = (function() {
+  function Star({ marked, starId }) {
+    return (
+      <span star-id={starId} style={{ color: '#ff9933' }} role='button'>
+        {marked ? '\u2605' : '\u2606'}
+      </span>
+    );
+  }
+
+  return class StarRating extends React.Component {
+    constructor(props) {
+      super(props);
+      this.state = {
+        rating: typeof props.rating == 'number' ? props.rating : 0,
+        selection: 0
+      };
+      this.hoverOver = this.hoverOver.bind(this);
+      this.hoverOut = this.hoverOver.bind(this, null);
+      this.handleClick = this.handleClick.bind(this);
+    }
+    hoverOver(event) {
+      let val = 0;
+      if (event && event.target && event.target.getAttribute('star-id'))
+        val = event.target.getAttribute('star-id');
+      this.setState(state => ({ selection: val }));
+    }
+    handleClick(event) {
+      const val = event.target.getAttribute('star-id') || this.state.rating;
+      this.setState(state => ({ rating: val }));
+    }
+    render() {
+      return (
+        <div
+          onMouseOut={this.hoverOut}
+          onClick={this.handleClick}
+          onMouseOver={this.hoverOver}
+        >
+          {Array.from({ length: 5 }, (v, i) => (
+            <Star
+              starId={i+1}
+              key={`star_${i+1} `}
+              marked={
+                this.state.selection
+                  ? this.state.selection >= i+1
+                  : this.state.rating >= i+1
+              }
+            />
+          ))}
+        </div>
+      );
+    }
+  };
+})();
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(<StarRating/>, document.getElementById('root'));
+ReactDOM.render(<StarRating rating={2} />, document.getElementById('root'));
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Tab
+
+Renders a tabbed menu and view component.
+
+Define `TabItem` as a middleware, pass it to the `Tab` and remove unnecessary nodes expect for `TabItem` by identifying the function's name in `props.children`.
+Use `Array.prototype.map` on the collected nodes to render the `tab-menu` and `tab-view`. 
+Define `changeTab`, which will be executed when clicking a `<button>` from the `tab-menu`.
+`changeTab` executes the passed callback, `onTabClick` and updates `state.bindIndex`, which in turn causes a re-render, evaluating the `style` and `className` of the `tab-view` items and `tab-menu` buttons according to their `index`.
+
+```css
+.tab-menu > button {
+  cursor: pointer;
+  padding: 8px 16px;
+  border: 0;
+  border-bottom: 2px solid transparent;
+  background: none;
+}
+.tab-menu > button.focus {
+  border-bottom: 2px solid #007BEF;
+}
+.tab-menu > button:hover {
+  border-bottom: 2px solid #007BEF;
+}
+```
+
+```jsx
+class Tab extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      bindIndex: props.defaultIndex
+    };
+  }
+  changeTab(newIndex) {
+    if (typeof this.props.onTabClick === "function")
+      this.props.onTabClick(newIndex);
+    this.setState({
+      bindIndex: newIndex
+    });
+  }
+  buttonClass(index) {
+    return this.state.bindIndex === index ? "focus" : "";
+  }
+  itemStyle(index) {
+    return {
+      display: this.state.bindIndex === index ? "block" : "none"
+    };
+  }
+  render() {
+    const items = this.props.children.filter(
+      item => item.type.name === "TabItem"
+    );
+    return (
+      <div className="wrapper">
+        <div className="tab-menu">
+          {items.map(({ props: { index, label } }) => (
+            <button
+              onClick={() => this.changeTab(index)}
+              className={this.buttonClass(index)}
+            >
+              {label}
+            </button>
+          ))}
+        </div>
+        <div className="tab-view">
+          {items.map(({ props }) => (
+            <div
+              {...props}
+              className="tab-view_item"
+              key={props.index}
+              style={this.itemStyle(props.index)}
+            />
+          ))}
+        </div>
+      </div>
+    );
+  }
+}
+function TabItem(props) {
+  return <div {...props} />;
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(
+  <Tab defaultIndex="1" onTabClick={console.log}>
+    <TabItem label="A" index="1">
+      Lorem ipsum
+    </TabItem>
+    <TabItem label="B" index="2">
+      Dolor sit amet
+    </TabItem>
+  </Tab>,
+  document.getElementById("root")
+);
+
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Ticker
+
+Renders a ticker component.
+
+- The ticker state is initially set to zero 
+- When the `Tick!` button is clicked, `timer` is incremented periodically at the given `interval`
+- When the `Reset` button is clicked, the value of the timer is set to zero and the `setInterval` is cleared
+- The `setInterval` is cleared once the desired `time` is reached
+- `time` and `interval` are the required props
+
+```jsx
+class Ticker extends Component {
+	constructor(props) {
+		super(props);
+		this.state = {ticker: 0}
+		this.interval = null
+	}
+
+	tick = () => {
+		this.reset()
+		this.interval = setInterval(() => {
+			if (this.state.ticker < this.props.times) {
+				this.setState(({ ticker }) => ({ticker: ticker + 1}))
+			}else{
+				clearInterval(this.interval)
+			}
+		}, this.props.interval)
+	}
+
+	reset = () => {
+		this.setState({ticker: 0})
+		clearInterval(this.interval)
+	}
+
+	render() {
+		return (
+			<div>
+				<span style={{fontSize: 100}}>{this.state.ticker}</span>       
+				<button onClick={this.tick}>Tick!</button>
+				<button onClick={this.reset}>Reset</button>
+			</div>
+		);
+	}
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(<Ticker times={5} interval={1000} />, document.getElementById('root'));
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Toggle
+
+Renders a toggle component.
+
+Initialize `state.isToggleOn` to `false`, bind the `handleClick` method to the component's context.
+Use an object, `style`, to hold the styles for individual components and their states.
+Create a method, `handleClick`, which uses `Component.prototype.setState` to change the component's `state.toggleOn`.
+In the `render()` method, destructure `state` and `style`, create a `<button>` that alters the component's `state` and determine the appearance of the content based on `state.isToggleOn`, applying the appropriate CSS rules from the `style` object.
+
+```jsx
+class Toggle extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      isToggleOn: false
+    };
+    this.style = {
+      on: {
+        backgroundColor: 'green'
+      },
+      off: {
+        backgroundColor: 'grey'
+      }
+    };
+
+    this.handleClick = this.handleClick.bind(this);
+  }
+
+  handleClick() {
+    this.setState(state => ({
+      isToggleOn: !state.isToggleOn
+    }));
+  }
+
+  render() {
+    const { isToggleOn } = this.state;
+    const { on, off } = this.style;
+
+    return (
+      <button
+        onClick={this.handleClick}
+        style={isToggleOn ? on : off}
+      >
+        {isToggleOn ? 'ON' : 'OFF'}
+      </button>
+    );
+  }
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ReactDOM.render(<Toggle />, document.getElementById('root'));
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Tooltip
+
+Renders a tooltip component.
+
+Set the `state` of the component to `show: false` initially, define an object, `style`, to hold the styles for individual components and their states.
+Create a method, `toggleTooltip`, which uses `this.setState` to change the state's `show` property from `true` to `false` and vice versa.
+Bind `showTooltip` and `hideTooltip` to the component's context with the respective values of `true` and `false`.
+In the `render()` method, compute if the tooltip should be shown or hidden, render the content of the tooltip and bind the `onMouseEnter` and `onMouseLeave` events to `showTooltip` and `hideTooltip` respectively.
+ 
+```jsx
+class Tooltip extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      show: false
+    };
+    this.style = {
+      tooltip: {
+        position: 'relative',
+        backgroundColor: "rgba(0,0,0,0.7)",
+        color: "white",
+        visibility: "hidden",
+        width: "fit-content",
+        padding: 5,
+        borderRadius: 5
+      },
+      tooltipArrow: {
+        position: 'absolute',
+        top: '100%',
+        left: '50%',
+        borderWidth: 5,
+        borderStyle: 'solid',
+        borderColor: "rgba(0,0,0,0.7) transparent transparent",
+      },
+      visible: {
+        visibility: "visible"
+      },
+    };
+    this.showTooltip = this.toggleTooltip.bind(this, true);
+    this.hideTooltip = this.toggleTooltip.bind(this, false);
+  }
+
+  toggleTooltip = tooltipState => {
+    this.setState({
+      show: tooltipState
+    });
+  };
+
+  render() {
+    const { children, text, ...rest } = this.props;
+    const { show } = this.state;
+    const { visible, tooltip, tooltipArrow } = this.style;
+    const showTooltip = show ? visible : {};
+    return (
+      <div>
+        <div style={{ ...tooltip, ...showTooltip }}>
+          {text}
+          <span style={tooltipArrow}/>
+        </div>
+        <div {...rest} onMouseEnter={this.showTooltip} onMouseLeave={this.hideTooltip}>
+          {children}
+        </div>
+      </div>
+    );
+  }
+}
+```
+
+<details>
+<summary>Examples</summary>
+
+```jsx
+ ReactDOM.render(
+     <Tooltip text='Simple tooltip'>
+       <button>Hover me!</button>
+     </Tooltip>,
+     document.getElementById('root')
+ );
+```
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+-----
+
+*This repository is a work in progress. If you want to contribute, please check the open issues to see where and how you can help out!*
+
+*This README is built using [markdown-builder](https://github.com/30-seconds/markdown-builder).*
diff --git a/data/snippet_data.json b/data/snippet_data.json
new file mode 100644
index 000000000..111bb6414
--- /dev/null
+++ b/data/snippet_data.json
@@ -0,0 +1,302 @@
+[
+  {
+    "name": "AutoLink.md",
+    "title": "AutoLink",
+    "text": "Renders a string as plaintext, with URLs converted to appropriate `<a>` elements.\n\nUse `String.prototype.split()` and `String.prototype.match()` with a regular expression to find URLs in a string.\nReturn a  `<React.Fragment>` with matched URLs rendered as `<a>` elements, dealing with missing protocol prefixes if necessary, and the rest of the string rendered as plaintext.\n\n",
+    "codeBlocks": [
+      "```jsx\nfunction AutoLink({ text }) {\n  const delimiter = /((?:https?:\\/\\/)?(?:(?:[a-z0-9]?(?:[a-z0-9\\-]{1,61}[a-z0-9])?\\.[^\\.|\\s])+[a-z\\.]*[a-z]+|(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3})(?::\\d{1,5})*[a-z0-9.,_\\/~#&=;%+?\\-\\\\(\\\\)]*)/gi;\n\n  return (\n    <React.Fragment>\n      {text.split(delimiter).map(word => {\n        let match = word.match(delimiter);\n        if (match) {\n          let url = match[0];\n          return (\n            <a href={url.startsWith(\"http\") ? url : `http://${url}`}>{url}</a>\n          );\n        }\n        return word;\n      })}\n    </React.Fragment>\n  );\n}\n```",
+      "```jsx\nReactDOM.render(\n  <AutoLink text='foo bar baz http://example.org bar' />,\n  document.getElementById('root')\n);\n```"
+    ],
+    "expertise": 2,
+    "tags": [
+      "string",
+      "fragment",
+      "functional"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Carousel.md",
+    "title": "Carousel",
+    "text": "Renders a carousel component.\n\nInitially set `state.active` to `0` (index of the first item).\nUse an object, `style`, to hold the styles for the individual components.\nDefine a method, `setActiveItem`, which uses `this.setState` to change the state's `active` property to the index of the next item.\nDefine another method, `changeItem`, which is called by `setActiveItem` after updating the state each time and also when the component\nfirst renders (on `ComponentDidMount`).\nIn the `render()` method, destructure `state`, `style` and `props`, compute if visibility style should be set to `visible` or not for each carousel item while mapping over and applying the combined style to the carousel item component accordingly.\nRender the carousel items using [React.cloneElement](https://reactjs.org/docs/react-api.html#cloneelement) and pass down rest\n`props` along with the computed styles.\n\n",
+    "codeBlocks": [
+      "```jsx\nclass Carousel extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      active: 0\n    };\n    this.scrollInterval = null;\n    this.style = {\n      carousel: {\n        position: \"relative\"\n      },\n      carouselItem: {\n        position: \"absolute\",\n        visibility: \"hidden\"\n      },\n      visible: {\n        visibility: \"visible\"\n      }\n    };\n  }\n  componentDidMount() {\n    this.changeItem();\n  }\n  setActiveItem = () => {\n    const { carouselItems } = this.props;\n    this.setState(\n      prevState => ({\n        active: (prevState.active + 1) % carouselItems.length\n      }),\n      this.changeItem\n    );\n  };\n  changeItem = () => {\n    this.scrollInterval = setTimeout(this.setActiveItem, 2000);\n  };\n  render() {\n    const { carouselItems, ...rest } = this.props;\n    const { active } = this.state;\n    const { visible, carousel, carouselItem } = this.style;\n    return (\n      <div style={carousel}>\n        {carouselItems.map((item, index) => {\n          const activeStyle = active === index ? visible : {};\n          return React.cloneElement(item, {\n            ...rest,\n            style: {\n              ...carouselItem,\n              ...activeStyle\n            }\n          });\n        })}\n      </div>\n    );\n  }\n}\n```",
+      "```jsx\nReactDOM.render(\n  <Carousel\n    carouselItems={[\n      <div>carousel item 1</div>,\n      <div>carousel item 2</div>,\n      <div>carousel item 3</div>\n    ]}\n  />,\n  document.getElementById(\"root\")\n);\n ```"
+    ],
+    "expertise": 2,
+    "tags": [
+      "visual",
+      "children",
+      "state",
+      "class"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Collapse.md",
+    "title": "Collapse",
+    "text": "Renders a component with collapsible content.\n\nUse the value of the `collapsed` prop to determine the initial state of the content (collapsed/expanded).\nSet the `state` of the component to the value of the `collapsed` prop (cast to a boolean value) and bind the `toggleCollapse` method to the component's context.\nUse an object, `style`, to hold the styles for individual components and their states.\nCreate a method, `toggleCollapse`, which uses `Component.prototype.setState` to change the component's `state` from collapsed to expanded and vice versa.\nIn the `render()` method, use a `<div>` to wrap both the `<button>` that alters the component's `state` and the content of the component, passed down via `props.children`.\nDetermine the appearance of the content, based on `state.collapsed` and apply the appropriate CSS rules from the `style` object.\nFinally, update the value of the `aria-expanded` attribute based on `state.collapsed` to make the component accessible.\n\n",
+    "codeBlocks": [
+      "```jsx\nclass Collapse extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      collapsed: !!props.collapsed\n    };\n    this.style = {\n      collapsed: {\n        display: 'none'\n      },\n      expanded: {\n        display: 'block'\n      },\n      buttonStyle: {\n        display: 'block',\n        width: '100%'\n      }\n    };\n    this.toggleCollapse = this.toggleCollapse.bind(this);\n  }\n  \n  toggleCollapse() {\n    this.setState(state => ({ collapsed: !state.collapsed }));\n  }\n  \n  render() {\n    return (\n      <div>\n        <button style={this.style.buttonStyle} onClick={this.toggleCollapse}>\n          {this.state.collapsed ? 'Show' : 'Hide'} content\n        </button>\n        <div \n          style= {this.state.collapsed ? this.style.collapsed : this.style.expanded} \n          aria-expanded = {this.state.collapsed}\n        >\n          {this.props.children}\n        </div>\n      </div>\n    );\n  }\n}\n```",
+      "```jsx\nReactDOM.render(\n  <Collapse>\n    <h1>This is a collapse</h1>\n    <p>Hello world!</p>\n  </Collapse>,\n  document.getElementById('root')\n);\n```"
+    ],
+    "expertise": 2,
+    "tags": [
+      "visual",
+      "children",
+      "state",
+      "class"
+    ],
+    "notes": []
+  },
+  {
+    "name": "DataList.md",
+    "title": "DataList",
+    "text": "Renders a list of elements from an array of primitives.\n\nUse the value of the `isOrdered` prop to conditionally render a `<ol>` or `<ul>` list.\nUse `Array.prototype.map` to render every item in `data` as a `<li>` element, give it a `key` produced from the concatenation of the its index and value.\nOmit the `isOrdered` prop to render a `<ul>` list by default.\n\n",
+    "codeBlocks": [
+      "```jsx\nfunction DataList({ isOrdered, data }) {\n  const list = data.map((val, i) => (\n    <li key={`${i}_${val}`}>{val}</li>\n  ));\n  return isOrdered ? <ol>{list}</ol> : <ul>{list}</ul>;\n}\n```",
+      "```jsx\nconst names = ['John', 'Paul', 'Mary'];\nReactDOM.render(<DataList data={names}/>, document.getElementById('root'));\nReactDOM.render(<DataList data={names} isOrdered/>, document.getElementById('root'));\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "array",
+      "functional"
+    ],
+    "notes": []
+  },
+  {
+    "name": "DataTable.md",
+    "title": "DataTable",
+    "text": "Renders a table with rows dynamically created from an array of primitives.\n\nRender a `<table>` element with two columns (`ID` and `Value`).\nUse `Array.prototype.map` to render every item in `data` as a `<tr>` element, consisting of its index and value, give it a `key` produced from the concatenation of the two.\n\n",
+    "codeBlocks": [
+      "```jsx\nfunction DataTable({ data }) {\n  return (\n    <table>\n      <thead>\n        <tr>\n          <th>ID</th>\n          <th>Value</th>\n        </tr>\n      </thead>\n      <tbody>\n        {data.map((val, i) =>\n          <tr key={`${i}_${val}`}>\n            <td>{i}</td>\n            <td>{val}</td>\n          </tr>\n        )}\n      </tbody>\n    </table>\n  );\n}\n```",
+      "```jsx\nconst people = ['John', 'Jesse'];\nReactDOM.render(\n  <DataTable data={people} />,\n  document.getElementById('root')\n);\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "array",
+      "functional"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Input.md",
+    "title": "Input",
+    "text": "Renders an `<input>` element that uses a callback function to pass its value to the parent component.\n\nUse object destructuring to set defaults for certain attributes of the `<input>` element.\nRender an `<input>` element with the appropriate attributes and use the `callback` function in the `onChange` event to pass the value of the input to the parent.\n\n",
+    "codeBlocks": [
+      "```jsx\nfunction Input ({ callback, type = 'text', disabled = false, readOnly = false, placeholder = '' }) {\n  return (\n    <input\n      type={type}\n      disabled={disabled}\n      readOnly={readOnly}\n      placeholder={placeholder}\n      onChange={({ target: { value } }) => callback(value)}\n    />\n  );\n}\n```",
+      "```jsx\nReactDOM.render(\n  <Input type='text' placeholder='Insert some text here...' callback={(val) => console.log(val)}/>,\n  document.getElementById('root')\n);\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "input",
+      "functional"
+    ],
+    "notes": []
+  },
+  {
+    "name": "LimitedTextarea.md",
+    "title": "LimitedTextarea",
+    "text": "Renders a textarea component with a character limit.\n\nUse the value of the `value` prop to determine the initial `state.content` and `state.characterCount` and the value of the `limit` props to determine the value of `state.limit`.\nCreate a method, `handleChange`, which trims the `event.target.value` data if necessary and uses `Component.prototype.setState` to update `state.content` and `state.characterCount`, and bind it to the component's context.\nIn the`render()` method, use a`<div>` to wrap both the`<textarea>` and the `<p>` element that displays the character count and bind the `onChange` event of the `<textarea>` to the `handleChange` method.\n\n",
+    "codeBlocks": [
+      "```jsx\nclass LimitedTextarea extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      content: props.value,\n      characterCount: props.value.length,\n      limit: props.limit\n    };\n    this.handleChange = this.handleChange.bind(this);\n  }\n  \n  handleChange(event) {\n    let newContent = event.target.value;\n    if(newContent.length >= this.state.limit) newContent = newContent.slice(0, this.state.limit);\n    this.setState(state => ({ content: newContent, characterCount: newContent.length }));\n  }\n  render() {\n    return (\n      <div>\n        <textarea \n          rows={this.props.rows} \n          cols={this.props.cols} \n          onChange={this.handleChange} \n          value={this.state.content}\n        >\n        </textarea>\n        <p>{this.state.characterCount}/{this.props.limit}</p>\n      </div>\n    );\n  }\n}\n```",
+      "```jsx\nReactDOM.render(\n  <LimitedTextarea limit={32} value='Hello!' />,\n  document.getElementById('root')\n);\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "input",
+      "state",
+      "class"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Mailto.md",
+    "title": "Mailto",
+    "text": "Renders a link formatted to send an email.\n\nDestructure the component's props, use `email`, `subject` and `body` to create a `<a>` element with an appropriate `href` attribute.\nRender the link with `props.children` as its content.\n\n",
+    "codeBlocks": [
+      "```jsx\nfunction Mailto({ email, subject, body, ...props }) {\n  return (\n    <a href={`mailto:${email}?subject=${subject || \"\"}&body=${body || \"\"}`}>\n      {props.children}\n    </a>\n  );\n}\n```",
+      "```jsx\nReactDOM.render(\n  <Mailto email=\"foo@bar.baz\" subject=\"Hello\" body=\"Hello world!\">\n    Mail me!\n  </Mailto>,\n  document.getElementById(\"root\")\n);\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "visual",
+      "functional"
+    ],
+    "notes": []
+  },
+  {
+    "name": "MappedTable.md",
+    "title": "MappedTable",
+    "text": "Renders a table with rows dynamically created from an array of objects and a list of property names.\n\nUse `Object.keys()`, `Array.prototype.filter()`, `Array.prototype.includes()` and `Array.prototype.reduce()` to produce a `filteredData` array, containing all objects with the keys specified in `propertyNames`.\nRender a `<table>` element with a set of columns equal to the amount of values in `propertyNames`.\nUse `Array.prototype.map` to render each value in the `propertyNames` array as a `<th>` element.\nUse `Array.prototype.map` to render each object in the `filteredData` array as a `<tr>` element, containing a `<td>` for each key in the object.\n\n",
+    "codeBlocks": [
+      "```jsx\nfunction MappedTable({ data, propertyNames }) {\n  let filteredData = data.map(v =>\n    Object.keys(v)\n      .filter(k => propertyNames.includes(k))\n      .reduce((acc, key) => ((acc[key] = v[key]), acc), {})\n  );\n  return (\n    <table>\n      <thead>\n        <tr>{propertyNames.map(val => <th key={`h_${val}`}>{val}</th>)}</tr>\n      </thead>\n      <tbody>\n        {filteredData.map((val, i) => (\n          <tr key={`i_${i}`}>\n            {propertyNames.map(p => <td key={`i_${i}_${p}`}>{val[p]}</td>)}\n          </tr>\n        ))}\n      </tbody>\n    </table>\n  );\n}\n```",
+      "```jsx\nconst people = [\n  { name: 'John', surname: 'Smith', age: 42 },\n  { name: 'Adam', surname: 'Smith', gender: 'male' }\n];\nconst propertyNames = ['name', 'surname', 'age'];\nReactDOM.render(\n  <MappedTable data={people} propertyNames={propertyNames} />,\n  document.getElementById('root')\n);\n```"
+    ],
+    "expertise": 1,
+    "tags": [
+      "array",
+      "object",
+      "functional"
+    ],
+    "notes": [
+      "This component does not work with nested objects and will break if there are nested objects inside any of the properties specified in `propertyNames`.",
+      "<!-tags: array,object,functional -->",
+      "<!-expertise: 1 -->"
+    ]
+  },
+  {
+    "name": "ModalDialog.md",
+    "title": "ModalDialog",
+    "text": "Renders a dialog component in a modal, controllable through events. \nTo use the component, import `ModalDialog` only once and then display it using `ModalDialog.show()`, passing the JSX templates and data as parameters.\n\nDefine `modalHandler`, a method that will handle showing the modal dialog, set `state` to the default values initially and bind the `close` and `modalClick` methods to the component's context.\nDefine `close` and `modalClick` to toggle the visibility of the modal dialog, based on `state.closeOnClick`.\nUse the CustomEvent API to listen for `modal` events, that can be dispatched from the `static` `show()` method, handle listeners appropriately from `componentDidMount` and `componentWillUnmount`.\n\nThe `show()` method accepts an argument, that should contain three parameters:\n* `title`, a string for the dialog's title\n* `closeOnClick`, `true` if the modal should close on click or `false` if it should only close when clicking the *X* button\n* `content`, which is the JSX content to be rendered inside the dialog\n\nFinally, in the `render()` method, use a `<div>` to wrap everything and render the modal dialog with the content passed to `show()`.\n\n",
+    "codeBlocks": [
+      "```css\n  .modal {\n    position: fixed;\n    top: 0;\n    left: 0;\n    width: 100%;\n    height: 100%;\n    background-color: rgba(0, 0, 0, 0.6);\n    z-index: 9998;\n    display: flex;\n    justify-content: center;\n    align-items: center;\n  }\n  .dialog {\n    background-color: white;\n    border-radius: 5px;\n    overflow: hidden;\n  }\n  .dialog-title {\n    box-sizing: border-box;\n    width: 100%;\n    height: 48px;\n    padding: 0 16px;\n    border-bottom: 0.5px solid #c3c3c3;\n    display: flex;\n    justify-content: space-between;\n    align-items: center;\n  }\n  .dialog-close {\n    font-size: 32px;\n    color: #c3c3c3;\n    cursor: pointer;\n    transform: rotate(45deg);\n    user-select: none;\n  }\n  .dialog-close:hover {\n    color: red;\n  }\n  .dialog-content {\n    min-width: 300px;\n  }\n```",
+      "```jsx\nclass ModalDialog extends React.Component {\n  constructor() {\n    super();\n    this.modalHandler = (e) => {\n      this.setState({\n        data: e.detail.data,\n        visible: true\n      });\n    };\n    this.state = {\n      data: {\n        title: '',\n        closeOnClick: false,\n        content: ''\n      },\n      visible: false\n    };\n    this.close = this.close.bind(this);\n    this.modalClick = this.modalClick.bind(this);\n  }\n  render() {\n    return !this.state.visible ? null : <div className=\"modal\" onClick={this.modalClick}>\n      <div className=\"dialog\">\n        <div className=\"dialog-title\">{ this.state.data.title }<span className=\"dialog-close\" onClick={this.close}>+</span></div>\n        <div className=\"dialog-content\">\n          {\n            this.state.data.content\n          }\n        </div>\n      </div>\n    </div>\n  }\n  componentDidMount() {\n    document.addEventListener('modal', this.modalHandler);\n  }\n  componentWillUnmount() {\n    document.removeEventListener('modal', this.modalHandler);\n  }\n  close() {\n    this.setState({\n      visible: false,\n      data: {\n        title: '',\n        closeOnClick: false,\n        content: ''\n      }\n    });\n  }\n  static show(data) {\n    document.dispatchEvent(new CustomEvent('modal', {\n      detail: {\n        data\n      }\n    }));\n  }\n  modalClick() {\n    if (this.state.data.closeOnClick) this.close();\n  }\n}\n```",
+      "```jsx\n// add to render function\n<ModalDialog />\n\n// every time you wanna call the dialog\n// content is a jsx element\nModalDialog.show({\n  title: 'Hello, world!',\n  closeOnClick: true,\n  content: <img src=\"https://github.com/30-seconds/30-seconds-of-react/blob/master/logo.png\"/>\n});  \n```"
+    ],
+    "expertise": 1,
+    "tags": [
+      "visual",
+      "static",
+      "children",
+      "state",
+      "class"
+    ],
+    "notes": [
+      "This component includes a lot of CSS, which might conflict with other CSS in your project. It is recomended for the modal to be a direct child of the body tag.",
+      "A more up-to-date method with lower compatibility is to use [Portals](https://reactjs.org/docs/portals.html) in React 16+.",
+      "<!-tags: visual,static,children,state,class -->",
+      "<!-expertise: 1 -->"
+    ]
+  },
+  {
+    "name": "PasswordRevealer.md",
+    "title": "PasswordRevealer",
+    "text": "Renders a password input field with a reveal button.\n\nInitially set `state.shown` to `false` to ensure that the password is not shown by default.\nCreate a method, `toggleShown`, which uses `Component.prototype.setState` to change the input's state from shown to hidden and vice versa, bind it to the component's context.\nIn the`render()` method, use a`<div>` to wrap both the`<input>` and the `<button>` element that toggles the type of the input field.\nFinally, bind the `<button>`'s `onClick` event to the `toggleShown` method.\n\n",
+    "codeBlocks": [
+      "```jsx\nclass PasswordRevealer extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      shown: false\n    };\n    this.toggleShown = this.toggleShown.bind(this);\n  }\n\n  toggleShown() {\n    this.setState(state => ({ shown: !state.shown }));\n  }\n\n  render() {\n    return (\n      <div>\n        <input\n          type={this.state.shown ? 'text' : 'password'}\n          value={this.props.value}\n        />\n        <button onClick={this.toggleShown}>Show/Hide</button>\n      </div>\n    );\n  }\n}\n```",
+      "```jsx\nReactDOM.render(<PasswordRevealer />, document.getElementById('root'));\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "input",
+      "state",
+      "class"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Select.md",
+    "title": "Select",
+    "text": "Renders a `<select>` element that uses a callback function to pass its value to the parent component.\n\nUse object destructuring to set defaults for certain attributes of the `<select>` element.\nRender a `<select>` element with the appropriate attributes and use the `callback` function in the `onChange` event to pass the value of the textarea to the parent.\nUse destructuring on the `values` array to pass an array of `value` and  `text` elements and the `selected` attribute to define the initial `value` of the `<select>` element.\n\n",
+    "codeBlocks": [
+      "```jsx\nfunction Select ({ values, callback, disabled = false, readonly = false, selected }) {\n  return (\n    <select\n      disabled={disabled}\n      readOnly={readonly}\n      onChange={({ target : { value } }) => callback(value)}\n    >\n      {values.map(([value, text]) => <option selected={selected === value}value={value}>{text}</option>)}\n    </select>\n  );\n}\n```",
+      "```jsx\nlet choices = [\n  ['grapefruit', 'Grapefruit'],\n  ['lime', 'Lime'],\n  ['coconut', 'Coconut'],\n  ['mango', 'Mango']\n];\nReactDOM.render(\n  <Select values={choices} selected='lime' callback={(val) => console.log(val)}/>,\n  document.getElementById('root')\n);\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "input",
+      "functional"
+    ],
+    "notes": []
+  },
+  {
+    "name": "StarRating.md",
+    "title": "StarRating",
+    "text": "Renders a star rating component.\n\nUse and IIFE to define a functional component, called `Star` that will render each individual star with the appropriate appearance, based on the parent component's `state` and return the class component `StarRating`.\nUse the value of the `rating` prop to determine if a valid rating is supplied and store it in `state.rating` (or `0` if invalid or not supplied).\nInitialize `state.selection` to `0`.\nCreate two methods, `hoverOver` and `setRating`, that take an event as argument and update `state.selected` and `state.rating` according to it, bind them both to the component's context.\nIn the `render()` method, create a `<div>` to wrap the `<Star>` components, which are created using `Array.prototype.map` on an array of 5 elements, created using `Array.from`, and handle the `onMouseLeave` event to set `state.selection` to `0`, the `onClick` event to set\nthe `state.rating` and the `onMouseOver` event to set `state.selection` to the `star-id` attribute of the `event.target` respectively. \nFinally, pass the appropriate values to each `<Star>` component (`starId` and `marked`).\n\n",
+    "codeBlocks": [
+      "```jsx\nconst StarRating = (function() {\n  function Star({ marked, starId }) {\n    return (\n      <span star-id={starId} style={{ color: '#ff9933' }} role='button'>\n        {marked ? '\\u2605' : '\\u2606'}\n      </span>\n    );\n  }\n\n  return class StarRating extends React.Component {\n    constructor(props) {\n      super(props);\n      this.state = {\n        rating: typeof props.rating == 'number' ? props.rating : 0,\n        selection: 0\n      };\n      this.hoverOver = this.hoverOver.bind(this);\n      this.hoverOut = this.hoverOver.bind(this, null);\n      this.handleClick = this.handleClick.bind(this);\n    }\n    hoverOver(event) {\n      let val = 0;\n      if (event && event.target && event.target.getAttribute('star-id'))\n        val = event.target.getAttribute('star-id');\n      this.setState(state => ({ selection: val }));\n    }\n    handleClick(event) {\n      const val = event.target.getAttribute('star-id') || this.state.rating;\n      this.setState(state => ({ rating: val }));\n    }\n    render() {\n      return (\n        <div\n          onMouseOut={this.hoverOut}\n          onClick={this.handleClick}\n          onMouseOver={this.hoverOver}\n        >\n          {Array.from({ length: 5 }, (v, i) => (\n            <Star\n              starId={i+1}\n              key={`star_${i+1} `}\n              marked={\n                this.state.selection\n                  ? this.state.selection >= i+1\n                  : this.state.rating >= i+1\n              }\n            />\n          ))}\n        </div>\n      );\n    }\n  };\n})();\n```",
+      "```jsx\nReactDOM.render(<StarRating/>, document.getElementById('root'));\nReactDOM.render(<StarRating rating={2} />, document.getElementById('root'));\n```"
+    ],
+    "expertise": 2,
+    "tags": [
+      "visual",
+      "children",
+      "input",
+      "state",
+      "class"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Tabs.md",
+    "title": "Tab",
+    "text": "Renders a tabbed menu and view component.\n\nDefine `TabItem` as a middleware, pass it to the `Tab` and remove unnecessary nodes expect for `TabItem` by identifying the function's name in `props.children`.\nUse `Array.prototype.map` on the collected nodes to render the `tab-menu` and `tab-view`. \nDefine `changeTab`, which will be executed when clicking a `<button>` from the `tab-menu`.\n`changeTab` executes the passed callback, `onTabClick` and updates `state.bindIndex`, which in turn causes a re-render, evaluating the `style` and `className` of the `tab-view` items and `tab-menu` buttons according to their `index`.\n\n",
+    "codeBlocks": [
+      "```css\n.tab-menu > button {\n  cursor: pointer;\n  padding: 8px 16px;\n  border: 0;\n  border-bottom: 2px solid transparent;\n  background: none;\n}\n.tab-menu > button.focus {\n  border-bottom: 2px solid #007BEF;\n}\n.tab-menu > button:hover {\n  border-bottom: 2px solid #007BEF;\n}\n```",
+      "```jsx\nclass Tab extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      bindIndex: props.defaultIndex\n    };\n  }\n  changeTab(newIndex) {\n    if (typeof this.props.onTabClick === \"function\")\n      this.props.onTabClick(newIndex);\n    this.setState({\n      bindIndex: newIndex\n    });\n  }\n  buttonClass(index) {\n    return this.state.bindIndex === index ? \"focus\" : \"\";\n  }\n  itemStyle(index) {\n    return {\n      display: this.state.bindIndex === index ? \"block\" : \"none\"\n    };\n  }\n  render() {\n    const items = this.props.children.filter(\n      item => item.type.name === \"TabItem\"\n    );\n    return (\n      <div className=\"wrapper\">\n        <div className=\"tab-menu\">\n          {items.map(({ props: { index, label } }) => (\n            <button\n              onClick={() => this.changeTab(index)}\n              className={this.buttonClass(index)}\n            >\n              {label}\n            </button>\n          ))}\n        </div>\n        <div className=\"tab-view\">\n          {items.map(({ props }) => (\n            <div\n              {...props}\n              className=\"tab-view_item\"\n              key={props.index}\n              style={this.itemStyle(props.index)}\n            />\n          ))}\n        </div>\n      </div>\n    );\n  }\n}\nfunction TabItem(props) {\n  return <div {...props} />;\n}\n```",
+      "```jsx\nReactDOM.render(\n  <Tab defaultIndex=\"1\" onTabClick={console.log}>\n    <TabItem label=\"A\" index=\"1\">\n      Lorem ipsum\n    </TabItem>\n    <TabItem label=\"B\" index=\"2\">\n      Dolor sit amet\n    </TabItem>\n  </Tab>,\n  document.getElementById(\"root\")\n);\n\n```"
+    ],
+    "expertise": 1,
+    "tags": [
+      "visual",
+      "children",
+      "class"
+    ],
+    "notes": []
+  },
+  {
+    "name": "TextArea.md",
+    "title": "TextArea",
+    "text": "Renders a `<textarea>` element that uses a callback function to pass its value to the parent component.\n\nUse object destructuring to set defaults for certain attributes of the `<textarea>` element.\nRender a `<textarea>` element with the appropriate attributes and use the `callback` function in the `onChange` event to pass the value of the textarea to the parent.\n\n",
+    "codeBlocks": [
+      "```jsx\nfunction TextArea ({ callback, cols = 20, rows = 2, disabled = false, readOnly = false, placeholder='' }) {\n  return (\n    <textarea\n      cols={cols}\n      rows={rows}\n      disabled={disabled}\n      readOnly={readOnly}\n      placeholder={placeholder}\n      onChange={({ target : { value } }) => callback(value)}\n    />\n  );\n}\n```",
+      "```jsx\nReactDOM.render(\n  <TextArea placeholder='Insert some text here...' callback={(val) => console.log(val)}/>,\n  document.getElementById('root')\n);\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "input",
+      "functional"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Ticker.md",
+    "title": "Ticker",
+    "text": "Renders a ticker component.\n\n- The ticker state is initially set to zero \n- When the `Tick!` button is clicked, `timer` is incremented periodically at the given `interval`\n- When the `Reset` button is clicked, the value of the timer is set to zero and the `setInterval` is cleared\n- The `setInterval` is cleared once the desired `time` is reached\n- `time` and `interval` are the required props\n\n",
+    "codeBlocks": [
+      "```jsx\nclass Ticker extends Component {\n\tconstructor(props) {\n\t\tsuper(props);\n\t\tthis.state = {ticker: 0}\n\t\tthis.interval = null\n\t}\n\n\ttick = () => {\n\t\tthis.reset()\n\t\tthis.interval = setInterval(() => {\n\t\t\tif (this.state.ticker < this.props.times) {\n\t\t\t\tthis.setState(({ ticker }) => ({ticker: ticker + 1}))\n\t\t\t}else{\n\t\t\t\tclearInterval(this.interval)\n\t\t\t}\n\t\t}, this.props.interval)\n\t}\n\n\treset = () => {\n\t\tthis.setState({ticker: 0})\n\t\tclearInterval(this.interval)\n\t}\n\n\trender() {\n\t\treturn (\n\t\t\t<div>\n\t\t\t\t<span style={{fontSize: 100}}>{this.state.ticker}</span>       \n\t\t\t\t<button onClick={this.tick}>Tick!</button>\n\t\t\t\t<button onClick={this.reset}>Reset</button>\n\t\t\t</div>\n\t\t);\n\t}\n}\n```",
+      "```jsx\nReactDOM.render(<Ticker times={5} interval={1000} />, document.getElementById('root'));\n```"
+    ],
+    "expertise": 1,
+    "tags": [
+      "visual",
+      "state",
+      "class"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Toggle.md",
+    "title": "Toggle",
+    "text": "Renders a toggle component.\n\nInitialize `state.isToggleOn` to `false`, bind the `handleClick` method to the component's context.\nUse an object, `style`, to hold the styles for individual components and their states.\nCreate a method, `handleClick`, which uses `Component.prototype.setState` to change the component's `state.toggleOn`.\nIn the `render()` method, destructure `state` and `style`, create a `<button>` that alters the component's `state` and determine the appearance of the content based on `state.isToggleOn`, applying the appropriate CSS rules from the `style` object.\n\n",
+    "codeBlocks": [
+      "```jsx\nclass Toggle extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      isToggleOn: false\n    };\n    this.style = {\n      on: {\n        backgroundColor: 'green'\n      },\n      off: {\n        backgroundColor: 'grey'\n      }\n    };\n\n    this.handleClick = this.handleClick.bind(this);\n  }\n\n  handleClick() {\n    this.setState(state => ({\n      isToggleOn: !state.isToggleOn\n    }));\n  }\n\n  render() {\n    const { isToggleOn } = this.state;\n    const { on, off } = this.style;\n\n    return (\n      <button\n        onClick={this.handleClick}\n        style={isToggleOn ? on : off}\n      >\n        {isToggleOn ? 'ON' : 'OFF'}\n      </button>\n    );\n  }\n}\n```",
+      "```jsx\nReactDOM.render(<Toggle />, document.getElementById('root'));\n```"
+    ],
+    "expertise": 0,
+    "tags": [
+      "visual",
+      "state",
+      "class"
+    ],
+    "notes": []
+  },
+  {
+    "name": "Tooltip.md",
+    "title": "Tooltip",
+    "text": "Renders a tooltip component.\n\nSet the `state` of the component to `show: false` initially, define an object, `style`, to hold the styles for individual components and their states.\nCreate a method, `toggleTooltip`, which uses `this.setState` to change the state's `show` property from `true` to `false` and vice versa.\nBind `showTooltip` and `hideTooltip` to the component's context with the respective values of `true` and `false`.\nIn the `render()` method, compute if the tooltip should be shown or hidden, render the content of the tooltip and bind the `onMouseEnter` and `onMouseLeave` events to `showTooltip` and `hideTooltip` respectively.\n \n",
+    "codeBlocks": [
+      "```jsx\nclass Tooltip extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      show: false\n    };\n    this.style = {\n      tooltip: {\n        position: 'relative',\n        backgroundColor: \"rgba(0,0,0,0.7)\",\n        color: \"white\",\n        visibility: \"hidden\",\n        width: \"fit-content\",\n        padding: 5,\n        borderRadius: 5\n      },\n      tooltipArrow: {\n        position: 'absolute',\n        top: '100%',\n        left: '50%',\n        borderWidth: 5,\n        borderStyle: 'solid',\n        borderColor: \"rgba(0,0,0,0.7) transparent transparent\",\n      },\n      visible: {\n        visibility: \"visible\"\n      },\n    };\n    this.showTooltip = this.toggleTooltip.bind(this, true);\n    this.hideTooltip = this.toggleTooltip.bind(this, false);\n  }\n\n  toggleTooltip = tooltipState => {\n    this.setState({\n      show: tooltipState\n    });\n  };\n\n  render() {\n    const { children, text, ...rest } = this.props;\n    const { show } = this.state;\n    const { visible, tooltip, tooltipArrow } = this.style;\n    const showTooltip = show ? visible : {};\n    return (\n      <div>\n        <div style={{ ...tooltip, ...showTooltip }}>\n          {text}\n          <span style={tooltipArrow}/>\n        </div>\n        <div {...rest} onMouseEnter={this.showTooltip} onMouseLeave={this.hideTooltip}>\n          {children}\n        </div>\n      </div>\n    );\n  }\n}\n```",
+      "```jsx\n ReactDOM.render(\n     <Tooltip text='Simple tooltip'>\n       <button>Hover me!</button>\n     </Tooltip>,\n     document.getElementById('root')\n );\n```"
+    ],
+    "expertise": 1,
+    "tags": [
+      "visual",
+      "state",
+      "children",
+      "class"
+    ],
+    "notes": []
+  }
+]
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 000000000..7fd82ec42
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,521 @@
+{
+  "name": "30-seconds-of-react",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "ansi-styles": {
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+    },
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+    },
+    "semver-compare": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/semver-compare/-/semver-compare-1.0.0.tgz",
+      "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w="
+    },
+    "shebang-command": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
+      "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=",
+      "requires": {
+        "shebang-regex": "^1.0.0"
+      }
+    },
+    "shebang-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
+      "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM="
+    },
+    "signal-exit": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
+      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
+    },
+    "slash": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/slash/-/slash-2.0.0.tgz",
+      "integrity": "sha512-ZYKh3Wh2z1PpEXWr0MpSBZ0V6mZHAQfYevttO11c51CaWjGTaadiKZ+wVt1PbMlDV5qhMFslpZCemhwOK7C89A=="
+    },
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+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
+      "integrity": "sha512-lr2EZCctC2BNR7j7WzJ2FpDznxky1sjfxvvYEyzxNyb6lZXHODmEoJeFu4JupYlkfha1KZpJyoqiJ7pgA1qq8Q==",
+      "requires": {
+        "spdx-expression-parse": "^3.0.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "spdx-exceptions": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz",
+      "integrity": "sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA=="
+    },
+    "spdx-expression-parse": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
+      "integrity": "sha512-Yg6D3XpRD4kkOmTpdgbUiEJFKghJH03fiC1OPll5h/0sO6neh2jqRDVHOQ4o/LMea0tgCkbMgea5ip/e+MkWyg==",
+      "requires": {
+        "spdx-exceptions": "^2.1.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "spdx-license-ids": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.3.tgz",
+      "integrity": "sha512-uBIcIl3Ih6Phe3XHK1NqboJLdGfwr1UN3k6wSD1dZpmPsIkb8AGNbZYJ1fOBk834+Gxy8rpfDxrS6XLEMZMY2g=="
+    },
+    "sprintf-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
+    },
+    "strip-eof": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8="
+    },
+    "supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
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+      "requires": {
+        "has-flag": "^3.0.0"
+      }
+    },
+    "universalify": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
+    },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 000000000..75f34b45a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,30 @@
+{
+  "name": "30-seconds-of-react",
+  "version": "1.0.0",
+  "description": "Curated collection of useful React snippets that you can understand in 30 seconds or less.",
+  "main": "index.js",
+  "scripts": {
+    "extractor": "node ./scripts/extract.js",
+    "builder": "node ./scripts/build.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/30-seconds/30-seconds-of-react.git"
+  },
+  "keywords": [
+    "react",
+    "snippets",
+    "javascript"
+  ],
+  "author": "30-seconds (30secondsofcode@gmail.com)",
+  "license": "CC0-1.0",
+  "bugs": {
+    "url": "https://github.com/30-seconds/30-seconds-of-react/issues"
+  },
+  "homepage": "https://github.com/30-seconds/30-seconds-of-react#readme",
+  "devDependencies": {
+    "chalk": "^2.4.2",
+    "fs-extra": "^7.0.1",
+    "markdown-builder": "^0.9.0"
+  }
+}
diff --git a/scripts/build.js b/scripts/build.js
new file mode 100644
index 000000000..cf40faf62
--- /dev/null
+++ b/scripts/build.js
@@ -0,0 +1,104 @@
+const fs = require("fs-extra");
+const path = require("path");
+const chalk = require("chalk");
+const util = require("./util.js");
+const markdown = require("markdown-builder");
+const snippets = require("../data/snippet_data.json")
+
+const { headers, misc, lists } = markdown;
+const TAG_NAMES = [...new Set(snippets.reduce((acc,v) => [...acc,v.tags[0]],[]))].sort((a,b) => a.localeCompare(b));
+console.log(TAG_NAMES);
+
+const STATIC_PARTS_PATH = "./static-parts";
+
+let startPart = "";
+let endPart = "";
+let output = "";
+
+const detailsTOC = (title, snippetsArray) =>
+  `\n${misc
+    .collapsible(
+      title,
+      lists
+        .ul(snippetsArray, snippet =>
+          misc.link(
+            snippet.title
+              .replace("\n", "")
+              .split("```")[0]
+              .trim(),
+            misc.anchor(
+              snippet.title
+                .replace("\n", "")
+                .split("```")[0]
+                .trim()
+            )
+          )
+        )
+        .trim()
+    )
+    .trim()}\n\n`;
+
+console.time("Builder");
+
+try {
+  startPart = fs.readFileSync(
+    path.join(STATIC_PARTS_PATH, "README-start.md"),
+    "utf8"
+  );
+  endPart = fs.readFileSync(
+    path.join(STATIC_PARTS_PATH, "README-end.md"),
+    "utf8"
+  );
+} catch (err) {
+  console.log(`${chalk.red("ERROR!")} During static part loading: ${err}`);
+  process.exit(1);
+}
+
+try {
+  // add static part for start
+  output += `${startPart}\n`;
+
+  const snippetsInTag = {};
+
+  TAG_NAMES.forEach(tag => snippetsInTag[tag] = snippets.filter(v => v.tags[0] == tag));
+
+  // write Table of Contents
+  TAG_NAMES.forEach(tag => {
+    const taggedSnippets = snippetsInTag[tag];
+    output += headers.h3(util.capitalize(tag));
+    output += detailsTOC("View contents", taggedSnippets);
+  });
+
+  // delimeter after TOC
+  output += misc.hr();
+
+  // write actual snippets
+  TAG_NAMES.forEach(tag => {
+    output += headers.h2(util.capitalize(tag));
+    const taggedSnippets = snippetsInTag[tag];
+    taggedSnippets.forEach(snippet => {
+      output += headers.h3(snippet.title).trim();
+      output += `\n\n${snippet.text}${snippet.codeBlocks.slice(0,-1).join('\n\n')}`;
+      if (snippet.notes && snippet.notes.length) {
+        output += headers.h4('Notes');
+        output += `\n${snippet.notes}`;
+      }
+      output += misc.collapsible('Examples', snippet.codeBlocks.slice(-1));
+      output += `\n<br>${misc.link(
+        "⬆ Back to top",
+        misc.anchor("Table of Contents")
+      )}\n\n`
+    })
+  });
+
+  // add static part for end
+  output += `\n${endPart}\n`;
+
+  fs.writeFileSync("README.md", output);
+} catch (err) {
+  console.log(`${chalk.red("ERROR!")} During README generation: ${err}`);
+  process.exit(1);
+}
+
+console.log(`${chalk.green("SUCCESS!")} README file generated!`);
+console.timeEnd("Builder");
\ No newline at end of file
diff --git a/scripts/extract.js b/scripts/extract.js
new file mode 100644
index 000000000..30594decb
--- /dev/null
+++ b/scripts/extract.js
@@ -0,0 +1,59 @@
+const fs = require("fs-extra")
+const path = require("path")
+const chalk = require("chalk")
+const {
+  attempt,
+  readSnippets,
+  getCodeBlocks,
+  getSection,
+  getTitle,
+  getTextualContent
+} = require("./util");
+
+console.time("Extractor");
+
+attempt("snippet_data.json generation", () => {
+  const output = Object.entries(readSnippets()).map(([name, contents]) => {
+    const title = getTitle(contents);
+    const text = getTextualContent(contents);
+    const codeBlocks = getCodeBlocks(contents);
+    const notes = getSection("#### Notes", contents, false)
+      .split("\n")
+      .map(v => v.replace(/[*-] /g, ""))
+      .filter(v => v.trim() !== "")
+    // const answer = getSection("#### Answer", contents)
+
+    // const goodToHear = getSection("#### Good to hear", contents, false)
+    //   .split("\n")
+    //   .map(v => v.replace(/[*-] /g, ""))
+    //   .filter(v => v.trim() !== "")
+
+    // const links = getSection("##### Additional links", contents)
+    //   .split("\n")
+    //   .filter(v =>
+    //     /(\/\*[\w\'\s\r\n\*]*\*\/)|(\/\/[\w\s\']*)|(\<![\-\-\s\w\>\/]*\>)/.test(
+    //       v
+    //     )
+    //   )
+    //   .map(v => v.replace(/[*-] /g, ""))
+    //   .filter(v => v.trim() !== "" && !v.includes("tags"))
+
+    return {
+      name,
+      title,
+      text,
+      codeBlocks,
+      expertise: parseInt(
+        (contents.match(/<!--\s*expertise:\s*\(*(.+)\)*/) || [])[1],
+        10
+      ),
+      tags: (contents.match(/<!--\s*tags:\s*\(*(.+)\)*\s*-->/) || [])[1].split(",").map(v => v.trim()),
+      notes
+    }
+  })
+
+  fs.writeFileSync("./data/snippet_data.json", JSON.stringify(output, null, 2))
+})
+
+console.log(`${chalk.green("SUCCESS!")} snippet_data.json file generated!`);
+console.timeEnd("Extractor");
\ No newline at end of file
diff --git a/scripts/util.js b/scripts/util.js
new file mode 100644
index 000000000..2c7457f88
--- /dev/null
+++ b/scripts/util.js
@@ -0,0 +1,95 @@
+const fs = require("fs-extra");
+const path = require("path");
+const chalk = require("chalk");
+
+const SNIPPETS_PATH = "./snippets";
+
+const attempt = (task, cb) => {
+  try {
+    return cb();
+  } catch (e) {
+    console.log(`${chalk.red("ERROR!")} During ${task}: ${e}`);
+    process.exit(1);
+    return null;
+  }
+};
+
+const capitalize = ([first, ...rest], lowerRest = false) =>
+  first.toUpperCase() + (lowerRest ? rest.join("").toLowerCase() : rest.join(""));
+
+const readSnippets = () =>
+  attempt("read snippets", () =>
+    fs
+      .readdirSync(SNIPPETS_PATH)
+      .sort((a, b) => (a.toLowerCase() < b.toLowerCase() ? -1 : 1))
+      .reduce((acc, name) => {
+        acc[name] = fs
+          .readFileSync(path.join(SNIPPETS_PATH, name), "utf8")
+          .replace(/\r\n/g, "\n");
+        return acc;
+      }, {})
+  );
+
+const getCodeBlocks = str => {
+  const regex = /```[.\S\s]*?```/g;
+  const results = [];
+  let m = null;
+  while ((m = regex.exec(str)) !== null) {
+    if (m.index === regex.lastIndex) {
+      regex.lastIndex += 1;
+    }
+    m.forEach(match => results.push(match));
+  }
+  return results;
+}
+
+const getSection = (searchString, contents, includeSubsections = true) => {
+  const indexOfSearch = contents.indexOf(searchString);
+  if (indexOfSearch < 0) return "";
+
+  let endSearch = "\\n#"
+  if (includeSubsections) {
+    let i;
+    for (i = 0; searchString[i] === "#" && i < searchString.length; i++);
+
+    if (i > 0) {
+      endSearch += `{${i - 1},${i}}[^#]`;
+    }
+  }
+  const endRegex = new RegExp(endSearch);
+
+  const sliceStart = indexOfSearch + searchString.length + 1;
+  const endIndex = contents.slice(sliceStart).search(endRegex);
+  const sliceEnd = endIndex === -1 ? undefined : endIndex + sliceStart;
+
+  return contents.slice(sliceStart, sliceEnd).trim();
+}
+
+const getTextualContent = str => {
+  const regex = /###.*\n*([\s\S]*?)```/g;
+  const results = [];
+  let m = null;
+  while ((m = regex.exec(str)) !== null) {
+    if (m.index === regex.lastIndex)
+      regex.lastIndex += 1;
+
+    m.forEach((match, groupIndex) => {
+      results.push(match);
+    });
+  }
+  return results[1];
+};
+
+const getTitle = (contents) =>
+  contents.split('\n')[0].replace(/^#+\s+/g,'');
+
+module.exports = {
+  attempt,
+  readSnippets,
+  SNIPPETS_PATH,
+  capitalize,
+  getTextualContent,
+  getCodeBlocks,
+  getSection,
+  getTitle
+};
\ No newline at end of file
diff --git a/snippets/Collapse.md b/snippets/Collapse.md
index fd1202ae4..4da570282 100644
--- a/snippets/Collapse.md
+++ b/snippets/Collapse.md
@@ -40,7 +40,7 @@ class Collapse extends React.Component {
     return (
       <div>
         <button style={this.style.buttonStyle} onClick={this.toggleCollapse}>
-          Show/Hide Content
+          {this.state.collapsed ? 'Show' : 'Hide'} content
         </button>
         <div 
           style= {this.state.collapsed ? this.style.collapsed : this.style.expanded} 
diff --git a/snippets/FileDrop.md b/snippets/FileDrop.md
new file mode 100644
index 000000000..c64075fee
--- /dev/null
+++ b/snippets/FileDrop.md
@@ -0,0 +1,117 @@
+### FileDrop
+
+Renders a file drag and drop component for a single file.
+
+Create a ref called `dropRef` for this component.
+Initialize `state.drag` and `state.filename` to `false` and `''` respectively.
+The variables `dragCounter` and `state.drag` are used to determine if a file is being dragged, while `state.filename` is used to store the dropped file's name.
+Create the `handleDrag`, `handleDragIn`, `handleDragOut` and `handleDrop` methods to handle drag and drop functionality,  bind them to the component's context.
+Each of the methods will handle a specific event, the listeners for which are created and removed in `componentDidMount` and `componentWillUnmount` respectively.
+`handleDrag` prevents the browser from opening the dragged file, `handleDragIn` and `handleDragOut` handle the dragged file entering and exiting the component, while `handleDrop` handles the file being dropped and passes it to `this.props.handleDrop`.
+In the `render()` method, create an appropriately styled `<div>` and use `state.drag` and `state.filename` to determine its contents and style. 
+Finally, bind the `ref` of the created `<div>` to `dropRef`.
+
+
+```css
+.filedrop {
+  min-height: 120px;
+  border: 3px solid #D3D3D3;
+  text-align: center;
+  font-size: 24px;
+  padding: 32px;
+  border-radius: 4px;
+}
+
+.filedrop.drag {
+  border: 3px dashed #1E90FF;
+}
+
+.filedrop.ready {
+  border: 3px solid #32CD32;
+}
+```
+
+```jsx
+class FileDrop extends React.Component {
+  constructor(props) {
+    super(props);
+    this.dropRef = React.createRef();
+    this.state = {
+      drag: false,
+      filename: ''
+    }
+    this.handleDrag = this.handleDrag.bind(this);
+    this.handleDragIn = this.handleDragIn.bind(this);
+    this.handleDragOut = this.handleDragOut.bind(this);
+    this.handleDrop = this.handleDrop.bind(this);
+  }
+
+  handleDrag(e) {
+    e.preventDefault();
+    e.stopPropagation();
+  }
+
+  handleDragIn(e) {
+    e.preventDefault();
+    e.stopPropagation();
+    this.dragCounter++;
+    if (e.dataTransfer.items && e.dataTransfer.items.length > 0) 
+      this.setState({ drag: true });
+  }
+
+  handleDragOut(e) {
+    e.preventDefault();
+    e.stopPropagation();
+    this.dragCounter--;
+    if (this.dragCounter === 0) 
+      this.setState({ drag: false });
+  }
+
+  handleDrop(e) {
+    e.preventDefault();
+    e.stopPropagation();
+    this.setState({ drag: false });
+    if (e.dataTransfer.files && e.dataTransfer.files.length > 0) {
+      this.props.handleDrop(e.dataTransfer.files[0]);
+      this.setState({ filename : e.dataTransfer.files[0].name});
+      e.dataTransfer.clearData();
+      this.dragCounter = 0;
+    }
+  }
+
+  componentDidMount() {
+    let div = this.dropRef.current;
+    div.addEventListener('dragenter', this.handleDragIn);
+    div.addEventListener('dragleave', this.handleDragOut);
+    div.addEventListener('dragover', this.handleDrag);
+    div.addEventListener('drop', this.handleDrop);
+  }
+
+  componentWillUnmount() {
+    let div = this.dropRef.current;
+    div.removeEventListener('dragenter', this.handleDragIn);
+    div.removeEventListener('dragleave', this.handleDragOut);
+    div.removeEventListener('dragover', this.handleDrag);
+    div.removeEventListener('drop', this.handleDrop);
+  }
+
+  render() {
+    return (
+      <div ref={this.dropRef} className={this.state.drag ? 'filedrop drag' : this.state.filename ? 'filedrop ready' : 'filedrop'}>
+        {this.state.filename && !this.state.drag ? 
+          <div>{this.state.filename}</div>
+          : <div>Drop files here!</div>
+        }
+      </div>
+    )
+  }
+}
+```
+
+```jsx
+ReactDOM.render(<FileDrop handleDrop={console.log}/>, document.getElementById('root'));
+```
+
+<!-- tags: visual,input,state,class -->
+
+<!-- expertise: 2 -->
diff --git a/snippets/LimitedTextarea.md b/snippets/LimitedTextarea.md
index 2092ba7f8..995e73630 100644
--- a/snippets/LimitedTextarea.md
+++ b/snippets/LimitedTextarea.md
@@ -47,7 +47,7 @@ ReactDOM.render(
 );
 ```
 
-< !--tags: input,state,class -- >
+<!-- tags: input,state,class -->
 
-< !--expertise: 0 -- >
+<!-- expertise: 0 -->
 
diff --git a/snippets/Mailto.md b/snippets/Mailto.md
index 24b5740dc..df3412efc 100644
--- a/snippets/Mailto.md
+++ b/snippets/Mailto.md
@@ -24,6 +24,6 @@ ReactDOM.render(
 );
 ```
 
-<!-- tags: functional -->
+<!-- tags: visual,functional -->
 
 <!-- expertise: 0 -->
diff --git a/snippets/Ticker.md b/snippets/Ticker.md
index d6e669559..e319fb69b 100644
--- a/snippets/Ticker.md
+++ b/snippets/Ticker.md
@@ -47,3 +47,7 @@ class Ticker extends Component {
 ```jsx
 ReactDOM.render(<Ticker times={5} interval={1000} />, document.getElementById('root'));
 ```
+
+<!-- tags: visual,state,class -->
+
+<!-- expertise: 1 -->
\ No newline at end of file
diff --git a/static-parts/README-end.md b/static-parts/README-end.md
new file mode 100644
index 000000000..b913aa3b3
--- /dev/null
+++ b/static-parts/README-end.md
@@ -0,0 +1,5 @@
+-----
+
+*This repository is a work in progress. If you want to contribute, please check the open issues to see where and how you can help out!*
+
+*This README is built using [markdown-builder](https://github.com/30-seconds/markdown-builder).*
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+![Logo](/logo.png)
+
+# 30 seconds of React
+
+> Curated collection of useful React snippets that you can understand in 30 seconds or less.
+
+#### Related projects
+
+* [30 Seconds of Code](https://30secondsofcode.org)
+* [30 Seconds of CSS](https://30-seconds.github.io/30-seconds-of-css/)
+* [30 Seconds of Interviews](https://30secondsofinterviews.org/)
+
+## Table of Contents