fix(mutliselectcheckbox): rewrite with hooks

snippets/MultiselectCheckbox.md

@@ -2,63 +2,51 @@
 
 ##
 
-Renders a checkbox list with the options provided through `props`.
+Renders a checkbox list with the `options` provided through `props`.
 
 Initially, all the items in the `options` array only have label ( and / or other data provided by the user ) and `checked` is `undefined` if not provided. On clicking any of the items, the `checked` value for the item is toggled and state is updated with the new list.
 
-The checkbox input in this case is kept as `readOnly` since click events are handled for the item ( label + input ) and not the `input` alone. An `onChange` prop can be passed to the `MultiCheckbox` component to get the updated list on every change event within the list.
+An `onChange` prop can be passed to the `MultiCheckbox` component to get the updated list on every change event within the list.
 
 ```jsx
-export default class MultiCheckbox extends React.Component {
-  constructor(props) {
-    super(props);
-    this.style = {
-      listContainer: {
-        listStyle: "none",
-        paddingLeft: 0
-      },
-      itemStyle: {
-        cursor: "pointer",
-        padding: 5
-      }
-    };
-    this.state = {
-      options: props.options
-    };
-  }
+import React, { useState } from 'react'
 
-  toggle = item => {
-    const { options } = this.state;
-    const { onChange } = this.props;
-    options.map((_, key) => {
-      if (options[key].label === item.label) {
-        options[key].checked = !item.checked;
-      }
-    });
-    this.setState(
-      {
-        options
-      },
-      () => {
-        onChange(options);
-      }
-    );
-  };
-
-  render() {
-    const { options } = this.state;
-    return (
-      <ul style={this.style.listContainer}>
-        {options.map(item => (
-          <li style={this.style.itemStyle} onClick={() => this.toggle(item)}>
-            <input readOnly type="checkbox" checked={item.checked || false} />
-            {item.label}
-          </li>
-        ))}
-      </ul>
-    );
+const style = {
+  listContainer: {
+    listStyle: 'none',
+    paddingLeft: 0,
+  },
+  itemStyle: {
+    cursor: 'pointer',
+    padding: 5,
   }
 }
+
+const MultiCheckbox = ({ options, onChange }) => {
+  const [data, updateOptions] = useState(options);
+
+  function toggle(item) {
+    data.map((_, key) => {
+      if (data[key].label === item.label) {
+        data[key].checked = !item.checked;
+      }
+    });
+    updateOptions(data);
+    onChange(data);
+  }
+
+  return (
+    <ul style={style.listContainer}>
+      {
+        data.map(item => {
+          return <li key={item.label} style={style.itemStyle} onClick={() => toggle(item)}><input readOnly type="checkbox" checked={item.checked || false} />{item.label}</li>
+        })
+      }
+    </ul>
+  )
+}
+
+export default MultiCheckbox;
 ```
 
 ```jsx
@@ -74,3 +62,6 @@ ReactDOM.render(
   document.getElementById("root")
 );
 ```
+
+#### Notes:
+* The checkbox input in this case is kept as `readOnly` since click events are handled for the item ( label + input ) and not the `input` alone.