JavaScript Array every() Method
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JavaScript Array every() Method
The every() method tests whether all elements in the array pass the test implemented by the provided function.
Note: This method does not alter the original array.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Is Smith passed all exams?</p>
<script>
var john = [55, 95, 33, 75];
var smith = [70, 80, 48, 95];
var passMark = 45;
function checkPass(mark) {
return mark >= passMark;
}
document.write(smith.every(checkPass));
</script>
</body>
</html>
Syntax
Array.every(function(value, index, arr), thisArg);
//or
Array.every(functionName);
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| function(value, index, arr) | Required | Function to test for each element in an array. Value - Specifies a value or element in an array. index - Specifies the index of a value or element in an array. arr - Specifies the whole array. |
| thisArg | Optional | Specifies a value against which each element in an array is tested. |
Return Values
| Value | Explanation |
|---|---|
| true | If every element in an array passes the test. If the given array is empty. |
| false | If any of the elements in an array fails the test. |
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Is John passed all exams?<p>
<script>
var john = [55, 95, 33, 75];
var smith = [70, 80, 48, 95];
var passMark = 45;
function checkPass(mark, index, arr) {
return mark >= this;
}
document.write(john.every(checkPass, passMark));
</script>
</body>
</html>
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