JavaScript Array some()

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Example 1

Check if any values are over 18:

const ages = [3, 10, 18, 20];

ages.some(checkAdult);
function checkAdult(age) {
return age > 18;
}

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Description

The some() method checks if any array elements pass a test (provided as a callback function).

The some() method executes the callback function once for each array element.

The some() method returns true (and stops) if the function returns true for one of the array elements.

The some() method returns false if the function returns false for all of the array elements.

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

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

Syntax

array.some(function(value, index, arr), this)

Parameters

Parameter

Description

function

Required.
A function to run for each array element.

Function parameters:

value	Required. The value of the current element.
index	Optional. The index of the current element.
arr	Optional. The array the current element belongs to.

this

Optional. Default undefined.
A value passed to the function to be used as its "this" value.

Return Value

Type	Description
A boolean	`true` if any of the aray elements pass the test, otherwise `false`.

Example 2

<p>Input: <input type="number" id="toCheck" value="15"></p>

<button onclick="myFunction()">Test</button>

<p>Values higher: <span id="demo"></span></p>

<script>
const numbers = [4, 12, 16, 20];

function checkValue(x) {
return x > document.getElementById("toCheck").value;
}

function myFunction() {
document.getElementById("demo").innerHTML = numbers.some(checkValue);
}
</script>

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