JavaScript Array every()

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Example 1

Check if all values in ages[] are over 18:

const ages = [32, 33, 16, 40];

ages.every(checkAge)

function checkAge(age) {
return age > 18;
}

Try it Yourself »

More examples below.

Definition and Usage

The every() method executes a function for each array element.

The every() method returns true if the function returns true for all elements.

The every() method returns false if the function returns false for one element.

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

The every() method does not change the original array

Syntax

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

Parameters

Parameter	Description
function()	Required. A function to be run for each element in the array.
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
A boolean	`true` if all elements pass the test, otherwise `false`.

More Examples

Check if all answers are the same:

Try it Yourself »

Check if all values are over a specific number:

<p><input type="number" id="ageToCheck" value="18"></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.every(checkAge);
}
</script>