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What is the usage of every() method in JavaScript?
- 王林forward
- 2023-09-01 23:05:06772browse
JavaScript ArraysEach method tests whether all elements in the array pass the test implemented by the provided function.
The following are the parameters -
- callback - the function used to test each element.
- thisObject >− The object used as this when executing the callback.
Example
You can try running the following code to understand how to operate each () method in JavaScript -
<html>
<head>
<title>JavaScript Array every Method</title>
</head>
<body>
<script>
if (!Array.prototype.every) {
Array.prototype.every = function(fun /*, thisp*/) {
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
var thisp = arguments[1];
for (var i = 0; i < len; i++) {
if (i in this && !fun.call(thisp, this[i], i, this))
return false;
}
return true;
};
}
function isBigEnough(element, index, array) {
return (element >= 10);
}
var passed = [12, 5, 8, 130, 44].every(isBigEnough);
document.write("First Test Value : " + passed );
passed = [12, 54, 18, 130, 44].every(isBigEnough);
document.write("<br>Second Test Value : " + passed );
</script>
</body>
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