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What is the role of filter() method in JavaScript?
JavaScript array filter() method creates a new array with all elements that pass the test implemented by the provided function.
The following are the parameters −
callback − Function to test each element of the array.
thisObject − Object to use as this when executing callback.
You can try to run the following code to learn how to work with filter() method in JavaScript −
Example
<html>
<head>
<title>JavaScript Array filter Method</title>
</head>
<body>
<script>
if (!Array.prototype.filter) {
Array.prototype.filter = function(fun /*, thisp*/) {
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
var res = new Array();
var thisp = arguments[1];
for (var i = 0; i < len; i++) {
if (i in this) {
var val = this[i]; // in case fun mutates this
if (fun.call(thisp, val, i, this))
res.push(val);
}
}
return res;
};
}
function isBigEnough(element, index, array) {
return (element >= 10);
}
var filtered = [12, 5, 8, 130, 44].filter(isBigEnough);
document.write("Filtered Value : " + filtered );
</script>
</body>
</html>
Updated on: 30-Jul-2019
185 Views
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