November 23, 2023 - const list = [😀, 😫, 😀, 😫, 🤪]; list.findIndex((⚪️) => ⚪️ === 😀); // 0 // You might be thinking how it's different from `indexOf` 🤔 const array = [5, 12, 8, 130, 44]; array.findIndex((element) => element > 13); // 3 // OR const array = [{ id: 😀 }, { id: 😫 }, { id: 🤪 }]; array.findIndex((element) => element.id === 🤪); // 2

Cheat sheet of Array methods in JavaScript. GitHub Gist: instantly share code, notes, and snippets.

Credits: Axel Rauschmayer · Adding or removing an element at either end of an Array: (return value: item or new array length)

May 27, 2026 - Free JavaScript cheat sheet: variables, data types, strings, array methods, objects, functions, destructuring, and async/await in quick-reference tables.

August 31, 2023 - Beginners are usually overwhelmed ... an array has, so I've prepared a cheat sheet that can help you get a quick lookup at what a method does. The cheat sheet contains a short description and a quick example of what a method does. You can download it here: Congratulations on finishing this JavaScript Array ...

A cheat sheet that could tell you exactly which array method to use for your specific problem. Instead of just showing you all the methods and wishing you ‘best of luck’, it would tell you ‘For this problem, try…’ · Enter the ‘Civilised Guide to JavaScript Array Methods’. It’s my free gift to anyone who subscribes for updates.

This cheat sheet includes 17 commonly used array methods: ... I also turned this cheat sheet into a video. If you find this video or cheat sheet useful, you say thanks by subscribing to my channel. In JavaScript, all arrays are constructed from the global Array class.

Elements can be accessed by their index using the array name, and the index surrounded by square brackets. ... The .push() method of JavaScript arrays can be used to add one or more elements to the end of an array.

August 13, 2023 - 30 Javascript Array Methods: A Cheat Sheet for Developers JavaScript, an array is a data structure that contains a list of elements that store multiple values in a single variable. Array methods are …

March 11, 2026 - Master JavaScript array methods like map, filter, and reduce with practical examples. A complete guide for developers with TypeScript integration and real-world patterns.

My book “JavaScript for impatient programmers” contains a comprehensive quick reference: Lists all Array methods (a few methods were omitted in the cheat sheet)

Array Methods Cheat Sheet · Never struggle with arrays again

March 25, 2026 - Complete JavaScript array methods reference with examples. Covers map, filter, reduce, find, flat, at, toSorted, groupBy, and every modern array method you need.

January 24, 2024 - The some() method tests whether at least one element in the array passes the test implemented by the provided function. It returns true if, in the array, it finds an element for which the provided function returns true; otherwise it returns false.

March 7, 2024 - 🌟 Welcome to this article, your go-to cheat sheet for essential array and object methods frequently applied in your work or personal projects. This guide ensures you're well-prepared for upcoming articles on implementing JavaScript data structures. Don't hesitate to comment if you spot any crucial methods I might have overlooked.

February 6, 2025 - Mutator Methods (Modify the original array) push(element1, ..., elementN) Adds elements...

May 20, 2022 - JavaScript cheat-sheet : array methods 1.concat() The concat() method is used to join two or more arrays. This method does not change the existing arrays, but returns a new array, containing the …

June 21, 2026 - A quick reference for adding, transforming, searching, and ordering items in JavaScript arrays. 01Use push(), pop(), shift(), and unshift() to add or remove items. 02Use map(), filter(), and reduce() to transform array data.

June 1, 2023 - ... It's very easy to declare an array using the [] bracket. At first, you have to declare the array name and then assign the entire Array. For example, ... We currently have 9 elements or pieces of data stored under the arrayName.

June 3, 2025 - Learn 13 powerful and essential JavaScript array tips, tricks, and methods that every developer should know. Ideal for interviews and clean code.