JavaScript Array filter() Method

Last Updated : 10 Jan, 2025

The filter() method creates a new array containing elements that satisfy a specified condition. This method skips empty elements and does not change the original array.

Create a new array consisting of only those elements that satisfy the condition checked by canVote() function.

JavaScript

// JavaScript to illustrate findIndex() method function canVote(age) {     return age >= 18; }  let filtered = [24, 33, 16, 40].filter(canVote); console.log(filtered);

Output

[ 24, 33, 40 ]

Syntax

array.filter(callback(element, index, arr), thisValue)

Parameters: This method accepts five parameters as mentioned above and described below:

Parameter	Description
callback	The function is to be called for each element of the array.
element	The value of the element currently being processed.
index	(Optional) The index of the current element in the array, starting from 0.
arr	(Optional) The complete array on which `Array.every` is called.
thisValue	(Optional) The context to be passed as `this` to be used while executing the callback function. If not provided, `undefined` is used as the default context.

Return value: It returns an array of elements that pass the test and an empty array if no elements pass the test.

Example 1: Creating a new array consisting of only those elements that satisfy the condition checked by isPositive() function.

JavaScript

function isPositive(value) {     return value > 0; }  let filtered = [112, 52, 0, -1, 944].filter(isPositive); console.log(filtered);

Output

[ 112, 52, 944 ]

Example 2: Creating a new array consisting of only those elements that satisfy the condition checked by isEven() function.

JavaScript

function isEven(value) {     return value % 2 == 0; }  let filtered = [11, 98, 31, 23, 944].filter(isEven); console.log(filtered);

Output

[ 98, 944 ]

We have a complete list of Javascript Array methods, to check those please go through this Javascript Array Complete reference article.

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