Replace or append a value in a JavaScript array
Quickly and easily replace or append a value in a JavaScript array.
JavaScript Array Snippets
The JavaScript snippet 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 · Convert a NodeList to a JavaScript array
Ever needed to convert a
NodeListto an array in JavaScript? Here's the fastest way to do so. -
JavaScript · Heap sort
Sort an array of numbers, using the heapsort algorithm.
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JavaScript · Calculate the ranking of a JavaScript array
Calculate the ranking of an array based on a comparator function in JavaScript.
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JavaScript · Selection sort
Sort an array of numbers, using the selection sort algorithm.
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JavaScript · Quick sort
Sort an array of numbers, using the quicksort algorithm.
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JavaScript · Bucket sort
Sort an array of numbers, using the bucket sort algorithm.
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JavaScript · Sampling, shuffling and weighted selection in JavaScript arrays
Learn how to shuffle, sample and perform weighted selection on JavaScript arrays.
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JavaScript · Min and max value of a JavaScript array
When working with JavaScript arrays, you might need the minimum or maximum value. Here are a few quick and easy ways to do it.
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JavaScript · Toggle element in a JavaScript array
Remove an element from an array if it's included in the array, or push it to the array if it isn't.
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JavaScript · Make any JavaScript value iterable
Did you know you can define an iterator for any JavaScript value? This quick tip will show you how.
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JavaScript · Map a JavaScript object to an array
Map an object to an object array, using the provided mapping function.
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JavaScript · What is the difference between JavaScript's for...in, for...of and forEach?
Learn the differences between the three most commonly used iteration methods in JavaScript, that often confuse beginners and veterans alike.
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JavaScript · Compact an array or object in JavaScript
Learn how to compact an array or object in JavaScript using the
Booleanfunction and recursion. -
JavaScript · Combine 2 JavaScript object arrays based on a key
Learn how to merge two arrays of objects, while combining objects based on a specified key.
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JavaScript · Negative index in JavaScript array
Ever wanted to use negative indices in JavaScript arrays? Here's a simple way to do it using a Proxy.
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JavaScript · Convert the output of a JavaScript generator to an array
Converts the output of any generator function to an array using the spread operator.
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JavaScript · Refactoring your for...in loops to avoid ESLint warnings
ESLint is a really useful tool, but sometimes it gets in the way. Learn how to refactor code to get rid of a common warning.
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JavaScript · How can I split a JavaScript array into two groups?
Learn how to split a JavaScript array into two groups based on a function or an array of values.
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JavaScript · How do I compare two arrays in JavaScript?
Learn how you can compare two arrays in JavaScript using various different techniques.
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JavaScript · Count the occurrences of a value in a JavaScript array or string
Given a value, find out how many times it appears in an array or string.
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JavaScript · What is the difference between Array.prototype.map() and Array.prototype.forEach()?
Which method do you reach for first? What are the differences between them? Let's find out!
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JavaScript · Create an array of partial sums in JavaScript
Create an array of partial sums, using
Array.prototype.reduce()andArray.prototype.slice(). -
JavaScript · Merge sort
Sort an array of numbers, using the merge sort algorithm.