diff --git a/snippets/forEachRight.md b/snippets/forEachRight.md
index 8e9686f2c..eca45a102 100644
--- a/snippets/forEachRight.md
+++ b/snippets/forEachRight.md
@@ -5,7 +5,8 @@ tags: array,intermediate
 
 Executes a provided function once for each array element, starting from the array's last element.
 
-- Use `Array.prototype.slice()` to clone the given array, `Array.prototype.reverse()` to reverse it and `Array.prototype.forEach()` to iterate over the reversed array.
+- Use `Array.prototype.slice()` to clone the given array and `Array.prototype.reverse()` to reverse it.
+- Use `Array.prototype.forEach()` to iterate over the reversed array.
 
 ```js
 const forEachRight = (arr, callback) =>
diff --git a/snippets/forOwn.md b/snippets/forOwn.md
index add62d1b9..01773585b 100644
--- a/snippets/forOwn.md
+++ b/snippets/forOwn.md
@@ -5,7 +5,8 @@ tags: object,intermediate
 
 Iterates over all own properties of an object, running a callback for each one.
 
-- Use `Object.keys(obj)` to get all the properties of the object, `Array.prototype.forEach()` to run the provided function for each key-value pair.
+- Use `Object.keys(obj)` to get all the properties of the object.
+- Use `Array.prototype.forEach()` to run the provided function for each key-value pair.
 - The callback receives three arguments - the value, the key and the object.
 
 ```js
diff --git a/snippets/forOwnRight.md b/snippets/forOwnRight.md
index f775582f1..acc992e4d 100644
--- a/snippets/forOwnRight.md
+++ b/snippets/forOwnRight.md
@@ -5,7 +5,8 @@ tags: object,intermediate
 
 Iterates over all own properties of an object in reverse, running a callback for each one.
 
-- Use `Object.keys(obj)` to get all the properties of the object, `Array.prototype.reverse()` to reverse their order and `Array.prototype.forEach()` to run the provided function for each key-value pair.
+- Use `Object.keys(obj)` to get all the properties of the object, `Array.prototype.reverse()` to reverse their order.
+- Use `Array.prototype.forEach()` to run the provided function for each key-value pair.
 - The callback receives three arguments - the value, the key and the object.
 
 ```js
diff --git a/snippets/formToObject.md b/snippets/formToObject.md
index cfc0d5917..49b10e7e6 100644
--- a/snippets/formToObject.md
+++ b/snippets/formToObject.md
@@ -3,10 +3,10 @@ title: formToObject
 tags: browser,object,intermediate
 ---
 
-Encode a set of form elements as an `object`.
+Encodes a set of form elements as an `object`.
 
-- Use the `FormData` constructor to convert the HTML `form` to `FormData`, `Array.from()` to convert to an array.
-- Collect the object from the array, using `Array.prototype.reduce()`.
+- Use the `FormData` constructor to convert the HTML `form` to `FormData` and `Array.from()` to convert to an array.
+- Collect the object from the array using `Array.prototype.reduce()`.
 
 ```js
 const formToObject = form =>
@@ -20,5 +20,6 @@ const formToObject = form =>
 ```
 
 ```js
-formToObject(document.querySelector('#form')); // { email: 'test@email.com', name: 'Test Name' }
+formToObject(document.querySelector('#form'));
+// { email: 'test@email.com', name: 'Test Name' }
 ```
diff --git a/snippets/formatDuration.md b/snippets/formatDuration.md
index 4e9df4e71..79135760d 100644
--- a/snippets/formatDuration.md
+++ b/snippets/formatDuration.md
@@ -3,7 +3,7 @@ title: formatDuration
 tags: date,math,string,intermediate
 ---
 
-Returns the human readable format of the given number of milliseconds.
+Returns the human-readable format of the given number of milliseconds.
 
 - Divide `ms` with the appropriate values to obtain the appropriate values for `day`, `hour`, `minute`, `second` and `millisecond`.
 - Use `Object.entries()` with `Array.prototype.filter()` to keep only non-zero values.
diff --git a/snippets/frequencies.md b/snippets/frequencies.md
index 8c2e14835..1b3afdcc7 100644
--- a/snippets/frequencies.md
+++ b/snippets/frequencies.md
@@ -1,9 +1,9 @@
 ---
 title: frequencies
-tags: array,intermediate
+tags: array,object,intermediate
 ---
 
-Returns an object with the unique values of an array as keys and their frequencies as the values.
+Creates an object with the unique values of an array as keys and their frequencies as the values.
 
 - Use `Array.prototype.reduce()` to map unique values to an object's keys, adding to existing keys every time the same value is encountered.
 
diff --git a/snippets/fullscreen.md b/snippets/fullscreen.md
index d394ec91d..e2118dbfc 100644
--- a/snippets/fullscreen.md
+++ b/snippets/fullscreen.md
@@ -5,8 +5,8 @@ tags: browser,intermediate
 
 Opens or closes an element in fullscreen mode.
 
-- Use `document.querySelector()` and `Element.prototype.requestFullscreen()` to open the given element in fullscreen.
-- Use `document.exitFullscreen()` to exit fullscreen mode.
+- Use `Document.querySelector()` and `Element.requestFullscreen()` to open the given element in fullscreen.
+- Use `Document.exitFullscreen()` to exit fullscreen mode.
 - Omit the second argument, `el`, to use `body` as the default element.
 - Omit the first element, `mode`, to open the element in fullscreen mode by default.
 
diff --git a/snippets/functionName.md b/snippets/functionName.md
index be32b9cb7..1c9353cd9 100644
--- a/snippets/functionName.md
+++ b/snippets/functionName.md
@@ -5,12 +5,15 @@ tags: function,beginner
 
 Logs the name of a function.
 
-- Use `console.debug()` and the `name` property of the passed method to log the method's name to the `debug` channel of the console.
+- Use `console.debug()` and the `name` property of the passed function to log the function's name to the `debug` channel of the console.
+- Return the given function `fn`.
 
 ```js
 const functionName = fn => (console.debug(fn.name), fn);
 ```
 
 ```js
-functionName(Math.max); // max (logged in debug channel of console)
+let m = functionName(Math.max)(5, 6);
+// max (logged in debug channel of console)
+// m = 6
 ```
diff --git a/snippets/functions.md b/snippets/functions.md
index 488c32a97..2b6155e9a 100644
--- a/snippets/functions.md
+++ b/snippets/functions.md
@@ -1,9 +1,9 @@
 ---
 title: functions
-tags: object,function,intermediate
+tags: object,function,advanced
 ---
 
-Returns an array of function property names from own (and optionally inherited) enumerable properties of an object.
+Gets an array of function property names from own (and optionally inherited) enumerable properties of an object.
 
 - Use `Object.keys(obj)` to iterate over the object's own properties.
 - If `inherited` is `true`, use `Object.get.PrototypeOf(obj)` to also get the object's inherited properties.
diff --git a/snippets/generateItems.md b/snippets/generateItems.md
index 192fcd93a..70a9a11dc 100644
--- a/snippets/generateItems.md
+++ b/snippets/generateItems.md
@@ -6,6 +6,7 @@ tags: array,function,intermediate
 Generates an array with the given amount of items, using the given function.
 
 - Use  `Array.from()`  to create an empty array of the specific length, calling `fn` with the index of each newly created element.
+- The callback takes one argument - the index of each element.
 
 ```js
 const generateItems = (n, fn) => Array.from({ length: n }, (_, i) => fn(i));
diff --git a/snippets/geometricProgression.md b/snippets/geometricProgression.md
index 7e58898c6..dfb5dbd2c 100644
--- a/snippets/geometricProgression.md
+++ b/snippets/geometricProgression.md
@@ -13,7 +13,7 @@ Returns an error if `step` equals `1`.
 ```js
 const geometricProgression = (end, start = 1, step = 2) =>
   Array.from({ length: Math.floor(Math.log(end / start) / Math.log(step)) + 1 }).map(
-    (v, i) => start * step ** i
+    (_, i) => start * step ** i
   );
 ```
 
diff --git a/snippets/get.md b/snippets/get.md
index 78f37cf75..fe5c2f084 100644
--- a/snippets/get.md
+++ b/snippets/get.md
@@ -1,12 +1,13 @@
 ---
 title: get
-tags: object,intermediate
+tags: object,regexp,intermediate
 ---
 
-Retrieve a set of properties indicated by the given selectors from an object.
+Retrieves a set of properties indicated by the given selectors from an object.
 
 - Use `Array.prototype.map()` for each selector, `String.prototype.replace()` to replace square brackets with dots.
-- Use `String.prototype.split('.')` to split each selector, `Array.prototype.filter()` to remove empty values and `Array.prototype.reduce()` to get the value indicated by it.
+- Use `String.prototype.split('.')` to split each selector.
+- Use `Array.prototype.filter()` to remove empty values and `Array.prototype.reduce()` to get the value indicated by each selector.
 
 ```js
 const get = (from, ...selectors) =>
@@ -20,6 +21,10 @@ const get = (from, ...selectors) =>
 ```
 
 ```js
-const obj = { selector: { to: { val: 'val to select' } }, target: [1, 2, { a: 'test' }] };
-get(obj, 'selector.to.val', 'target[0]', 'target[2].a'); // ['val to select', 1, 'test']
+const obj = {
+  selector: { to: { val: 'val to select' } },
+  target: [1, 2, { a: 'test' }],
+};
+get(obj, 'selector.to.val', 'target[0]', 'target[2].a');
+// ['val to select', 1, 'test']
 ```
diff --git a/snippets/getAncestors.md b/snippets/getAncestors.md
index f962c47e6..3dacd10de 100644
--- a/snippets/getAncestors.md
+++ b/snippets/getAncestors.md
@@ -20,5 +20,6 @@ const getAncestors = el => {
 ```
 
 ```js
-getAncestors(document.querySelector('nav')); // [document, html, body, header, nav]
+getAncestors(document.querySelector('nav')); 
+// [document, html, body, header, nav]
 ```
diff --git a/snippets/getBaseURL.md b/snippets/getBaseURL.md
index 5bc4bc9be..c75b3635c 100644
--- a/snippets/getBaseURL.md
+++ b/snippets/getBaseURL.md
@@ -1,9 +1,9 @@
 ---
 title: getBaseURL
-tags: browser,string,beginner
+tags: string,browser,beginner
 ---
 
-Returns the current URL without any parameters.
+Gets the current URL without any parameters.
 
 - Use `String.prototype.indexOf()` to check if the given `url` has parameters, `String.prototype.slice()` to remove them if necessary.
 
diff --git a/snippets/getColonTimeFromDate.md b/snippets/getColonTimeFromDate.md
index 5488e2e22..0d35a6397 100644
--- a/snippets/getColonTimeFromDate.md
+++ b/snippets/getColonTimeFromDate.md
@@ -1,6 +1,6 @@
 ---
 title: getColonTimeFromDate
-tags: date,intermediate
+tags: date,string,beginner
 ---
 
 Returns a string of the form `HH:MM:SS` from a `Date` object.
@@ -12,5 +12,5 @@ const getColonTimeFromDate = date => date.toTimeString().slice(0, 8);
 ```
 
 ```js
-getColonTimeFromDate(new Date()); // "08:38:00"
+getColonTimeFromDate(new Date()); // '08:38:00'
 ```
diff --git a/snippets/getDaysDiffBetweenDates.md b/snippets/getDaysDiffBetweenDates.md
index c3282fb3e..91e4695a3 100644
--- a/snippets/getDaysDiffBetweenDates.md
+++ b/snippets/getDaysDiffBetweenDates.md
@@ -3,9 +3,9 @@ title: getDaysDiffBetweenDates
 tags: date,intermediate
 ---
 
-Returns the difference (in days) between two dates.
+Calculates the difference (in days) between two dates.
 
-- Calculate the difference (in days) between two `Date` objects.
+- Subtract the two `Date` object and divide by the number of milliseconds in a day to get the difference (in days) between them.
 
 ```js
 const getDaysDiffBetweenDates = (dateInitial, dateFinal) =>
diff --git a/snippets/getElementsBiggerThanViewport.md b/snippets/getElementsBiggerThanViewport.md
index 1dab76f2f..f53dac496 100644
--- a/snippets/getElementsBiggerThanViewport.md
+++ b/snippets/getElementsBiggerThanViewport.md
@@ -5,14 +5,14 @@ tags: browser,intermediate
 
 Returns an array of HTML elements whose width is larger than that of the viewport's.
 
-- Use `HTMLElement.prototype.offsetWidth()` to get the width of the `document`.
-- Use `Array.prototype.filter()` on the result of `document.querySelectorAll()` to check the width of all elements in the document.
+- Use `HTMLElement.offsetWidth` to get the width of the `document`.
+- Use `Array.prototype.filter()` on the result of `Document.querySelectorAll()` to check the width of all elements in the document.
 
 ```js
 const getElementsBiggerThanViewport = () => {
   const docWidth = document.documentElement.offsetWidth;
   return [...document.querySelectorAll('*')].filter(el => el.offsetWidth > docWidth);
-}
+};
 ```
 
 ```js
diff --git a/snippets/getMeridiemSuffixOfInteger.md b/snippets/getMeridiemSuffixOfInteger.md
index 024dd7673..1dfb0c90e 100644
--- a/snippets/getMeridiemSuffixOfInteger.md
+++ b/snippets/getMeridiemSuffixOfInteger.md
@@ -19,8 +19,8 @@ const getMeridiemSuffixOfInteger = num =>
 ```
 
 ```js
-getMeridiemSuffixOfInteger(0); // "12am"
-getMeridiemSuffixOfInteger(11); // "11am"
-getMeridiemSuffixOfInteger(13); // "1pm"
-getMeridiemSuffixOfInteger(25); // "1pm"
+getMeridiemSuffixOfInteger(0); // '12am'
+getMeridiemSuffixOfInteger(11); // '11am'
+getMeridiemSuffixOfInteger(13); // '1pm'
+getMeridiemSuffixOfInteger(25); // '1pm'
 ```
diff --git a/snippets/getMonthsDiffBetweenDates.md b/snippets/getMonthsDiffBetweenDates.md
index 2d4b4161f..077cf3b66 100644
--- a/snippets/getMonthsDiffBetweenDates.md
+++ b/snippets/getMonthsDiffBetweenDates.md
@@ -3,7 +3,7 @@ title: getMonthsDiffBetweenDates
 tags: date,intermediate
 ---
 
-Returns the difference (in months) between two dates.
+Calculates the difference (in months) between two dates.
 
 - Use `Date.prototype.getFullYear()` and `Date.prototype.getMonth()` to calculate the difference (in months) between two `Date` objects.
 
diff --git a/snippets/getProtocol.md b/snippets/getProtocol.md
index 9139116cb..36dae5297 100644
--- a/snippets/getProtocol.md
+++ b/snippets/getProtocol.md
@@ -3,7 +3,7 @@ title: getProtocol
 tags: browser,beginner
 ---
 
-Returns the protocol being used on the current page.
+Gets the protocol being used on the current page.
 
 - Use `window.location.protocol` to get the protocol (`http:` or `https:`) of the current page.
 
diff --git a/snippets/getScrollPosition.md b/snippets/getScrollPosition.md
index ff200c0f9..236b6a02f 100644
--- a/snippets/getScrollPosition.md
+++ b/snippets/getScrollPosition.md
@@ -5,8 +5,8 @@ tags: browser,intermediate
 
 Returns the scroll position of the current page.
 
-- Use `pageXOffset` and `pageYOffset` if they are defined, otherwise `scrollLeft` and `scrollTop`.
-- You can omit `el` to use a default value of `window`.
+- Use `Window.pageXOffset` and `Window.pageYOffset` if they are defined, otherwise `Element.scrollLeft` and `Element.scrollTop`.
+- Omit the single argument, `el`, to use a default value of `window`.
 
 ```js
 const getScrollPosition = (el = window) => ({
diff --git a/snippets/getSelectedText.md b/snippets/getSelectedText.md
index be6965d06..983af8bb5 100644
--- a/snippets/getSelectedText.md
+++ b/snippets/getSelectedText.md
@@ -3,9 +3,9 @@ title: getSelectedText
 tags: browser,beginner
 ---
 
-Get the currently selected text.
+Gets the currently selected text.
 
-- Use `window.getSelection()` and `Selection.prototype.toString()` to get the currently selected text.
+- Use `Window.getSelection()` and `Selection.toString()` to get the currently selected text.
 
 ```js
 const getSelectedText = () => window.getSelection().toString();
diff --git a/snippets/getSiblings.md b/snippets/getSiblings.md
index ae2230433..31b1b8954 100644
--- a/snippets/getSiblings.md
+++ b/snippets/getSiblings.md
@@ -5,7 +5,7 @@ tags: browser,intermediate
 
 Returns an array containing all the siblings of the given element.
 
-- Use `Node.prototype.parentNode` and `Node.prototype.childNodes` to get a `NodeList` of all the elements contained in the element's parent.
+- Use `Node.parentNode` and `Node.childNodes` to get a `NodeList` of all the elements contained in the element's parent.
 - Use the spread operator (`...`) and `Array.prototype.filter()` to convert to an array and remove the given element from it.
 
 ```js
diff --git a/snippets/getStyle.md b/snippets/getStyle.md
index 21d190184..7a930bf4e 100644
--- a/snippets/getStyle.md
+++ b/snippets/getStyle.md
@@ -3,7 +3,7 @@ title: getStyle
 tags: browser,css,beginner
 ---
 
-Returns the value of a CSS rule for the specified element.
+Retrieves the value of a CSS rule for the specified element.
 
 - Use `Window.getComputedStyle()` to get the value of the CSS rule for the specified element.
 
diff --git a/snippets/getTimestamp.md b/snippets/getTimestamp.md
index 54fac6213..3606ddb7c 100644
--- a/snippets/getTimestamp.md
+++ b/snippets/getTimestamp.md
@@ -10,8 +10,7 @@ Gets the Unix timestamp from a `Date` object.
 - Omit the argument, `date`, to use the current date.
 
 ```js
-const getTimestamp = (date = new Date()) =>
-  Math.floor(date.getTime() / 1000);
+const getTimestamp = (date = new Date()) => Math.floor(date.getTime() / 1000);
 ```
 
 ```js
diff --git a/snippets/getType.md b/snippets/getType.md
index 4d67e4cee..e7d00a14e 100644
--- a/snippets/getType.md
+++ b/snippets/getType.md
@@ -9,7 +9,8 @@ Returns the native type of a value.
 - Otherwise, use `Object.prototype.constructor.name` to get the name of the constructor.
 
 ```js
-const getType = v => (v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name);
+const getType = v =>
+  (v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name);
 ```
 
 ```js
diff --git a/snippets/getURLParameters.md b/snippets/getURLParameters.md
index 9abd2dcaa..4c0f04af2 100644
--- a/snippets/getURLParameters.md
+++ b/snippets/getURLParameters.md
@@ -1,11 +1,12 @@
 ---
 title: getURLParameters
-tags: browser,string,intermediate
+tags: browser,string,regexp,intermediate
 ---
 
 Returns an object containing the parameters of the current URL.
 
-- Use `String.prototype.match()` with an appropriate regular expression to get all key-value pairs, `Array.prototype.reduce()` to map and combine them into a single object.
+- Use `String.prototype.match()` with an appropriate regular expression to get all key-value pairs.
+- Use `Array.prototype.reduce()` to map and combine them into a single object.
 - Pass `location.search` as the argument to apply to the current `url`.
 
 ```js
@@ -17,6 +18,7 @@ const getURLParameters = url =>
 ```
 
 ```js
-getURLParameters('http://url.com/page?name=Adam&surname=Smith'); // {name: 'Adam', surname: 'Smith'}
 getURLParameters('google.com'); // {}
+getURLParameters('http://url.com/page?name=Adam&surname=Smith');
+// {name: 'Adam', surname: 'Smith'}
 ```
diff --git a/snippets/groupBy.md b/snippets/groupBy.md
index 93750a57d..575b971c9 100644
--- a/snippets/groupBy.md
+++ b/snippets/groupBy.md
@@ -5,7 +5,7 @@ tags: array,object,intermediate
 
 Groups the elements of an array based on the given function.
 
-- Use `Array.prototype.map()` to map the values of an array to a function or property name.
+- Use `Array.prototype.map()` to map the values of the array to a function or property name.
 - Use `Array.prototype.reduce()` to create an object, where the keys are produced from the mapped results.
 
 ```js
diff --git a/snippets/hammingDistance.md b/snippets/hammingDistance.md
index 631e4235e..51530ad35 100644
--- a/snippets/hammingDistance.md
+++ b/snippets/hammingDistance.md
@@ -1,15 +1,17 @@
 ---
 title: hammingDistance
-tags: math,regexp,intermediate
+tags: math,intermediate
 ---
 
 Calculates the Hamming distance between two values.
 
-- Use the XOR operator (`^`) to find the bit difference between the two numbers, convert to a binary string using `toString(2)`.
-- Count and return the number of `1`s in the string, using `match(/1/g)`.
+- Use the XOR operator (`^`) to find the bit difference between the two numbers.
+- Convert to a binary string using `Number.prototype.toString(2)`.
+- Count and return the number of `1`s in the string, using `String.prototype.match(/1/g)`.
 
 ```js
-const hammingDistance = (num1, num2) => ((num1 ^ num2).toString(2).match(/1/g) || '').length;
+const hammingDistance = (num1, num2) =>
+  ((num1 ^ num2).toString(2).match(/1/g) || '').length;
 ```
 
 ```js
diff --git a/snippets/hasClass.md b/snippets/hasClass.md
index 1cba5bc88..2b72c17f5 100644
--- a/snippets/hasClass.md
+++ b/snippets/hasClass.md
@@ -3,9 +3,9 @@ title: hasClass
 tags: browser,css,beginner
 ---
 
-Returns `true` if the element has the specified class, `false` otherwise.
+Checks if the given element has the specified class.
 
-- Use `element.classList.contains()` to check if the element has the specified class.
+- Use `Element.classList` and `DOMTokenList.contains()` to check if the element has the specified class.
 
 ```js
 const hasClass = (el, className) => el.classList.contains(className);
diff --git a/snippets/hasFlags.md b/snippets/hasFlags.md
index b1c9a13a1..af841f827 100644
--- a/snippets/hasFlags.md
+++ b/snippets/hasFlags.md
@@ -3,7 +3,7 @@ title: hasFlags
 tags: node,intermediate
 ---
 
-Check if the current process's arguments contain the specified flags.
+Checks if the current process's arguments contain the specified flags.
 
 - Use `Array.prototype.every()` and `Array.prototype.includes()` to check if `process.argv` contains all the specified flags.
 - Use a regular expression to test if the specified flags are prefixed with `-` or `--` and prefix them accordingly.
diff --git a/snippets/hasKey.md b/snippets/hasKey.md
index 09241ac3e..a0be3ee2a 100644
--- a/snippets/hasKey.md
+++ b/snippets/hasKey.md
@@ -3,7 +3,7 @@ title: hasKey
 tags: object,intermediate
 ---
 
-Returns `true` if the target value exists in a JSON object, `false` otherwise.
+Checks if the target value exists in a JSON object.
 
 - Check if `keys` is non-empty and use `Array.prototype.every()` to sequentially check its keys to internal depth of the object, `obj`.
 - Use `Object.prototype.hasOwnProperty()` to check if `obj` does not have the current key or is not an object, stop propagation and return `false`.
diff --git a/snippets/haveSameContents.md b/snippets/haveSameContents.md
index e2eb73ee3..97b232f6c 100644
--- a/snippets/haveSameContents.md
+++ b/snippets/haveSameContents.md
@@ -3,7 +3,7 @@ title: haveSameContents
 tags: array,intermediate
 ---
 
-Returns `true` if two arrays contain the same elements regardless of order, `false` otherwise.
+Checks if two arrays contain the same elements regardless of order.
 
 - Use a `for...of` loop over a `Set` created from the values of both arrays.
 - Use `Array.prototype.filter()` to compare the amount of occurrences of each distinct value in both arrays.
@@ -12,7 +12,8 @@ Returns `true` if two arrays contain the same elements regardless of order, `fal
 ```js
 const haveSameContents = (a, b) => {
   for (const v of new Set([...a, ...b]))
-    if (a.filter(e => e === v).length !== b.filter(e => e === v).length) return false;
+    if (a.filter(e => e === v).length !== b.filter(e => e === v).length)
+      return false;
   return true;
 };
 ```
diff --git a/snippets/head.md b/snippets/head.md
index 244afd216..b790e655b 100644
--- a/snippets/head.md
+++ b/snippets/head.md
@@ -5,7 +5,8 @@ tags: array,beginner
 
 Returns the head of an array.
 
-- Check if `arr` is truthy and has a `length` property, use `arr[0]` if possible to return the first element, otherwise return `undefined`.
+- Check if `arr` is truthy and has a `length` property.
+- Use `arr[0]` if possible to return the first element, otherwise return `undefined`.
 
 ```js
 const head = arr => (arr && arr.length ? arr[0] : undefined);
diff --git a/snippets/hexToRGB.md b/snippets/hexToRGB.md
index fe0bcc27f..0e74a66d2 100644
--- a/snippets/hexToRGB.md
+++ b/snippets/hexToRGB.md
@@ -3,7 +3,7 @@ title: hexToRGB
 tags: string,math,advanced
 ---
 
-Converts a color code to a `rgb()` or `rgba()` string if alpha value is provided.
+Converts a color code to an `rgb()` or `rgba()` string if alpha value is provided.
 
 - Use bitwise right-shift operator and mask bits with `&` (and) operator to convert a hexadecimal color code (with or without prefixed with `#`) to a string with the RGB values.
 - If it's 3-digit color code, first convert to 6-digit version.
diff --git a/snippets/httpDelete.md b/snippets/httpDelete.md
index 5471bded2..506929f34 100644
--- a/snippets/httpDelete.md
+++ b/snippets/httpDelete.md
@@ -5,7 +5,7 @@ tags: browser,intermediate
 
 Makes a `DELETE` request to the passed URL.
 
-- Use `XMLHttpRequest` web api to make a `delete` request to the given `url`.
+- Use the `XMLHttpRequest` web API to make a `DELETE` request to the given `url`.
 - Handle the `onload` event, by running the provided `callback` function.
 - Handle the `onerror` event, by running the provided `err` function.
 - Omit the third argument, `err` to log the request to the console's error stream by default.
@@ -23,7 +23,5 @@ const httpDelete = (url, callback, err = console.error) => {
 ```js
 httpDelete('https://jsonplaceholder.typicode.com/posts/1', request => {
   console.log(request.responseText);
-}); /*
-Logs: {}
-*/
+}); // Logs: {}
 ```
diff --git a/snippets/httpGet.md b/snippets/httpGet.md
index f246a2592..f42d8f7ac 100644
--- a/snippets/httpGet.md
+++ b/snippets/httpGet.md
@@ -5,7 +5,7 @@ tags: browser,intermediate
 
 Makes a `GET` request to the passed URL.
 
-- Use [`XMLHttpRequest`](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest) web api to make a `get` request to the given `url`.
+- Use the `XMLHttpRequest` web API to make a `GET` request to the given `url`.
 - Handle the `onload` event, by calling the given `callback` the `responseText`.
 - Handle the `onerror` event, by running the provided `err` function.
 - Omit the third argument, `err`, to log errors to the console's `error` stream by default.
diff --git a/snippets/httpPost.md b/snippets/httpPost.md
index e44b49f3f..cde8c2c6d 100644
--- a/snippets/httpPost.md
+++ b/snippets/httpPost.md
@@ -5,11 +5,10 @@ tags: browser,intermediate
 
 Makes a `POST` request to the passed URL.
 
-- Use [`XMLHttpRequest`](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest) web api to make a `post` request to the given `url`.
+- Use the `XMLHttpRequest` web API to make a `POST` request to the given `url`.
 - Set the value of an `HTTP` request header with `setRequestHeader` method.
 - Handle the `onload` event, by calling the given `callback` the `responseText`.
 - Handle the `onerror` event, by running the provided `err` function.
-- Omit the third argument, `data`, to send no data to the provided `url`.
 - Omit the fourth argument, `err`, to log errors to the console's `error` stream by default.
 
 ```js
diff --git a/snippets/httpPut.md b/snippets/httpPut.md
index feecfdbea..6e357afce 100644
--- a/snippets/httpPut.md
+++ b/snippets/httpPut.md
@@ -5,7 +5,7 @@ tags: browser,intermediate
 
 Makes a `PUT` request to the passed URL.
 
-- Use `XMLHttpRequest` web api to make a `put` request to the given `url`.
+- Use `XMLHttpRequest` web api to make a `PUT` request to the given `url`.
 - Set the value of an `HTTP` request header with `setRequestHeader` method.
 - Handle the `onload` event, by running the provided `callback` function.
 - Handle the `onerror` event, by running the provided `err` function.
diff --git a/snippets/httpsRedirect.md b/snippets/httpsRedirect.md
index a0a5b385e..469e893a6 100644
--- a/snippets/httpsRedirect.md
+++ b/snippets/httpsRedirect.md
@@ -3,11 +3,12 @@ title: httpsRedirect
 tags: browser,intermediate
 ---
 
-Redirects the page to HTTPS if its currently in HTTP. Also, pressing the back button doesn't take it back to the HTTP page as its replaced in the history.
+Redirects the page to HTTPS if it's currently in HTTP.
 
 - Use `location.protocol` to get the protocol currently being used.
 - If it's not HTTPS, use `location.replace()` to replace the existing page with the HTTPS version of the page.
 - Use `location.href` to get the full address, split it with `String.prototype.split()` and remove the protocol part of the URL.
+- Note that pressing the back button doesn't take it back to the HTTP page as its replaced in the history.
 
 ```js
 const httpsRedirect = () => {
@@ -16,5 +17,6 @@ const httpsRedirect = () => {
 ```
 
 ```js
-httpsRedirect(); // If you are on http://mydomain.com, you are redirected to https://mydomain.com
+httpsRedirect(); 
+// If you are on http://mydomain.com, you are redirected to https://mydomain.com
 ```
diff --git a/snippets/hz.md b/snippets/hz.md
index 35bc6842c..06528367a 100644
--- a/snippets/hz.md
+++ b/snippets/hz.md
@@ -3,8 +3,7 @@ title: hz
 tags: function,intermediate
 ---
 
-Returns the number of times a function executed per second.
-`hz` is the unit for `hertz`, the unit of frequency defined as one cycle per second.
+Measures the number of times a function is executed per second (`hz`/`hertz`).
 
 - Use `performance.now()` to get the difference in milliseconds before and after the iteration loop to calculate the time elapsed executing the function `iterations` times.
 - Return the number of cycles per second by converting milliseconds to seconds and dividing it by the time elapsed.
@@ -19,12 +18,8 @@ const hz = (fn, iterations = 100) => {
 ```
 
 ```js
-// 10,000 element array
-const numbers = Array(10000)
-  .fill()
-  .map((_, i) => i);
+const numbers = Array(10000).fill().map((_, i) => i);
 
-// Test functions with the same goal: sum up the elements in the array
 const sumReduce = () => numbers.reduce((acc, n) => acc + n, 0);
 const sumForLoop = () => {
   let sum = 0;
@@ -32,7 +27,6 @@ const sumForLoop = () => {
   return sum;
 };
 
-// `sumForLoop` is nearly 10 times faster
 Math.round(hz(sumReduce)); // 572
 Math.round(hz(sumForLoop)); // 4784
 ```