Apply a mapping function to each character in a JavaScript string
Learn how to replicate the behavior of Array.prototype.map() for strings.
JavaScript Articles
The JavaScript article collection contains a wide variety of ES6 helper functions. It includes helpers for dealing with primitives, arrays and objects, as well as algorithms, DOM manipulation functions and Node.js utilities.
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JavaScript · Map a JavaScript array to an object
Map the values of an array to an object, using the given mapping functions.
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JavaScript · How can I listen for a click outside of an element in JavaScript?
Detect and handle click events outside of a specific element in just a few lines of JavaScript.
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JavaScript · How can I create a JavaScript generator function that repeats one or more values indefinitely?
Learn how to create a generator function that repeats a given value or an array of values indefinitely.
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JavaScript · Find the day, week, month, or quarter of the year using JavaScript
Determine the day, week, month, or quarter of the year that a date corresponds to, using vanilla JavaScript.
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JavaScript · Check if a JavaScript collection is empty
Quickly determine if a collection of values is empty in JavaScript.
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JavaScript · You can't extend JavaScript's Proxy object
Turns out the Proxy object is not extensible, but there's a way around its limitations.
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JavaScript · Binary search in a sorted JavaScript array
Use the binary search algorithm to find the index of a given element in a sorted array.
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JavaScript · Generate all consecutive element subarrays from a JavaScript array
Create an array of
n-tuples of consecutive elements from a given array. -
JavaScript · How can I check if a JavaScript array includes a specific value?
Checking if an array includes a specific value is pretty straightforward, except when it comes to objects.
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JavaScript · Arithmetic and geometric progression in JavaScript
Create arrays of numbers in arithmetic and geometric progression.
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JavaScript · Check if all values of a JavaScript array are equal
Use the
Array.prototype.every()method to check if all values of an array are equal in JavaScript. -
JavaScript · Window.location Cheat Sheet
A quick reference for the
window.locationobject. -
JavaScript · What is hoisting in JavaScript?
Hoisting comes up a lot during JavaScript interviews. It's a concept that may require some getting used to, so read our guide to learn more.
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JavaScript · Sum of powers in range
s the sum of the powers of all the numbers from
starttoend(both inclusive). -
JavaScript · Remove the first or last n elements from a JavaScript array
Master JavaScript array element removal with these simple techniques.
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JavaScript · Remove accents from a JavaScript string
Learn how to remove accents from a string in JavaScript, quickly and efficiently.
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JavaScript · Calculate the powerset of a JavaScript array
Generate the powerset of a given array of numbers or other primitive values.
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JavaScript · Find the maximum subarray of a JavaScript array
Learn how to find the contiguous subarray with the largest sum within an array of numbers in JavaScript.
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JavaScript · Find the longest element in a JavaScript array
Find the element with the greatest
lengthin a JavaScript array. -
JavaScript · Calculate the Levenshtein distance between two strings in JavaScript
Implement the Levenshtein distance algorithm in JavaScript to calculate the difference between two strings.
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JavaScript · Get the last element of a JavaScript array
Array destructuring can be leveraged in many different ways. Here's one of them.
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JavaScript · Vertical offset of an element in the document
Find the distance from a given element to the top of the document with this simple JavaScript function.
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JavaScript · How can I detect the device type with JavaScript?
Learn how to detect whether a page is being viewed on a mobile device or a desktop.