Javascript Reference - JavaScript Array prototype Constructor

The prototype can add new properties and methods to the Array() object.

Array.prototype adds the methods and properties to the Array class, therefore all Array() object will have the added features.

Browser Support


`prototype`	Yes	Yes	Yes	Yes	Yes

Syntax

Array.prototype.newName = value;

Example

The following code shows how to add a new method to Array class to convert all element to upper case.


<!DOCTYPE html>
<html>
<body>
<button onclick="myFunction()">test</button>
<p id="demo"></p>
<script>
Array.prototype.myUcase = function() {<!--   w  w  w.  ja  va  2  s.c  o  m-->
    var i;
    for (i = 0; i < this.length; i++) {
        this[i] = this[i].toUpperCase();
    }
}

function myFunction() {
    var array1 = ["a", "b", "c", "d"];
    array1.myUcase();
    document.getElementById("demo").innerHTML = array1;
}
</script>

</body>
</html>

The code above is rendered as follows: