JavaScript (ES2026) reference · Array Methods

JavaScript Array filter() Method

Return a new array with only the elements that pass a test function. The original array is not changed.

JavaScript (ES2026) Since ES5

Syntax

array.filter(callbackFn, thisArg)

Parameter	Description
`callbackFn`	Called for each element with `(element, index, array)`.

A new array (possibly empty).

Keep matching elementsTry it yourself

const nums = [5, 12, 8, 130, 44];
console.log(nums.filter((n) => n > 10));

Output

[ 12, 130, 44 ]

Filter objects, then mapTry it yourself

const users = [
  { name: "Ada", active: true },
  { name: "Bob", active: false },
];
console.log(users.filter((u) => u.active).map((u) => u.name));

Output

[ 'Ada' ]

Remove falsy valuesTry it yourself

console.log([0, "", "hi", null, 42].filter(Boolean));

Output

[ 'hi', 42 ]

Version	Change
JavaScript ES5	Added

array.map() · Return a new array with the results of calling a function on every element. The original array is unchanged.
array.find() · Return the first element that passes a test function, or undefined if none does.
array.some() · Return true if at least one element passes a test function. Stops at the first match; an empty array returns false.
array.reduce() · Reduce the array to a single value by running a reducer function on each element, carrying an accumulator along.
JavaScript Arrays · tutorial
JavaScript Array Methods · tutorial