Compact an array or object in JavaScript
Learn how to compact an array or object in JavaScript using the Boolean function and recursion.
JavaScript Array 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.
-
JavaScript · -
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.
-
JavaScript · Using binary search to find the index to insert a number in a sorted JavaScript array
Combining techniques presented in the past, we can solve a more complex problem with stellar performance.
-
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.
-
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.
-
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.
-
JavaScript · How do I compare two arrays in JavaScript?
Learn how you can compare two arrays in JavaScript using various different techniques.
-
JavaScript · How can I initialize 2D array in JavaScript?
Learn how to initialize a 2D array in JavaScript in a handful of different ways.
-
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.
-
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!
-
JavaScript · How can I find the diameter of an undirected tree in JavaScript?
Using a two-pass DFS approach, we can efficiently find the diameter of an undirected tree in JavaScript.
-
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.
-
JavaScript · Join a JavaScript array into a string, with locale-sensitive separators
Learn how to leverage
Intl.ListFormatto join an array into a string, with appropriate separators. -
JavaScript · Group array elements based on a function
Group the elements of an array based on the given function, producing an object with the grouped values.
-
JavaScript · Set operations in JavaScript
Explore how you can apply mathematical set operations to JavaScript
Setobjects and arrays. -
JavaScript · Check if a numeric array is sorted in JavaScript
Efficiently check if a numeric array is sorted in ascending or descending order in JavaScript.
-
JavaScript · JavaScript array filtering tips
A few tips and tricks to help you filter arrays in JavaScript more efficiently.
-
JavaScript · Perform math operations on arrays of numbers in JavaScript
Learn how to work with arrays of numbers in JavaScript, performing common math operations such as sum, average, product and more.
-
JavaScript · How do I merge two arrays in JavaScript?
Arrays are one of the most used data types in any programming language. Learn how to merge two arrays in JavaScript with this short guide.
-
JavaScript · How can I find the insertion index of an element in a sorted JavaScript array?
Given a sorted array, find the correct index to insert a given value.
-
JavaScript · Check if a JavaScript array has only one or many matches
Learn how to check if an array has one or more values matching the given function, and how to find the matching elements.
-
JavaScript · Remove matching elements from a JavaScript array
Given a predicate function, remove elements from an array that match the given condition.
-
JavaScript · Insertion sort
Sort an array of numbers, using the insertion sort algorithm.