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JavaScript Array every() Method

❮ JavaScript Array Reference

Example

Check if all the values in the ages array are 18 or over:

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

function checkAdult(age) {
    return age >= 18;
}

function myFunction() {
    document.getElementById("demo").innerHTML = ages.every(checkAdult);
}

The result will be:

false
Try it Yourself »

More "Try it Yourself" examples below.


Definition and Usage

The every() method checks if all elements in an array pass a test (provided as a function).

The every() method executes the function once for each element present in the array:

  • If it finds an array element where the function returns a false value, every() returns false (and does not check the remaining values)
  • If no false occur, every() returns true

Note: every() does not execute the function for array elements without values.

Note: every() does not change the original array


Browser Support

The numbers in the table specify the first browser version that fully supports the method.

Method
every() Yes 9.0 1.5 Yes Yes

Syntax

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

Parameter Values

Parameter Description
function(currentValue, index, arr) Required. A function to be run for each element in the array.
Function arguments:
Argument Description
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

Technical Details

Return Value: A Boolean. Returns true if all the elements in the array pass the test, otherwise it returns false
JavaScript Version: ECMAScript 3

More Examples

Example

Check if all the values in the ages array are a specific number or over :

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

<p>All ages above minimum? <span id="demo"></span></p>

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

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

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

Example

Check if all the answer values in the array are the same:

<script>
var survey = [
    { name: "Steve", answer: "Yes"},
    { name: "Jessica", answer: "Yes"},
    { name: "Peter", answer: "Yes"},
    { name: "Elaine", answer: "No"}
];

function isSameAnswer(el, index, arr) {
    if (index === 0){
        return true;
    }
    else {
        return (el.answer === arr[index - 1].answer);
    }
}

function myFunction() {
    document.getElementById("demo").innerHTML = survey.every(isSameAnswer);
}
</script>
Try it Yourself »

❮ JavaScript Array Reference