Array filter() Method - Javascript Array

Javascript examples for Array:filter

  1. HOME
  2. Javascript
  3. Array
  4. filter

Description

The filter() method creates an array filled with all array elements that pass a test against another function.

filter() does not execute the function for array elements without values.

Syntax 

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

Parameter Values

Parameter Description
function(currentValue, index,arr) Required. A function to check for each element in the array.
currentValue Required. The value of the current element
index Optional. The array index of the current element
arr Optional. The array object the current element belongs to
thisValue Optional. A value to be passed to the function to be used as its "this" value. If this parameter is empty, the value "undefined" will be passed as its "this" value

Return Value:

An Array containing all the array elements that pass the test. If no elements pass the test it returns an empty array.

The following code shows how to return an array of all the values in the ages array that are 18 or over:

Demo Code

ResultView the demo in separate window 

<!DOCTYPE html>
<html>
<body>


<p>Minimum age: <input type="number" id="ageToCheck" value="18"></p>
<button onclick="myFunction()">Test</button>

<span id="demo"></span>

<script>
var ages = [32, 33, 12, 40];/* www .j a v a2s. co  m*/

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

function myFunction() {
    document.getElementById("demo").innerHTML = ages.filter(checkAdult);
}
</script>

</body>
</html>

Related Tutorials