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CSSStyleDeclaration JS Conversion


JavaScript Array filter()

Example 1

Return an array of all values in ages[] that are 18 or over:

const ages = [32, 33, 16, 40];
const result = ages.filter(checkAdult);

function checkAdult(age) {
  return age >= 18;
}
Try it Yourself »

Description

The filter() method creates a new array filled with elements that pass a test provided by a function.

The filter() method does not execute the function for empty elements.

The filter() method does not change the original array.


Syntax

array.filter(function(currentValue, index, arr), thisValue)

Parameters

Parameter Description
function() Required.
A function to run for each array element.
currentValue Required.
The value of the current element.
index Optional.
The index of the current element.
arr Optional.
The array of the current element.
thisValue Optional. Default undefined
A value passed to the function as its this value.

Return Value

Type Description
Array An array of elements that pass the test.
An empty array if no elements pass the test.

Example 2

Return the values in ages[] that are over a specific number:

<p><input type="number" id="ageToCheck" value="30"></p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
const ages = [32, 33, 12, 40];

function checkAge(age) {
  return age > document.getElementById("ageToCheck").value;
}

function myFunction() {
  document.getElementById("demo").innerHTML = ages.filter(checkAge);
}
</script>
Try it Yourself »


Browser Support

filter() is an ECMAScript5 (ES5) feature.

ES5 (JavaScript 2009) fully supported in all modern browsers since July 2013:

Chrome
23
IE/Edge
10
Firefox
21
Safari
6
Opera
15
Sep 2012 Sep 2012 Apr 2013 Jul 2012 Jul 2013