ES2019 added the Array flatMap() method to JavaScript. The flatMap() method first maps all elements of an array and then creates a new array by flattening the array.

Sep 28, 2025 · Several of the built-in array methods (e.g., join(), slice(), indexOf(), etc.) take into account the value of an array's length property when they're called. Other methods (e.g., …

This section provides you with the JavaScript Array methods that allow you to manipulate arrays effectively.

Aug 5, 2025 · To help you perform common tasks efficiently, JavaScript provides a wide variety of array methods. These methods allow you to add, remove, find, and transform array elements …

Dec 31, 2023 · Afterwards whenever you need to do something with an array, and you don’t know how – come here, look at the cheat sheet and find the right method. Examples will help you to …

Changing all of an Array (the input Array is modified and returned): ... Finding Array elements: ... Creating a new Array from an existing Array: ... Computing a summary of an Array: ... Listing …

Arrays are a special type of objects. The typeof operator in JavaScript returns "object" for arrays. But, JavaScript arrays are best described as arrays. Arrays use numbers to access its …