Javascript - Array prototype Property

The prototype property allows you to add new properties and methods to the Array() object.

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Description

The prototype property allows you to add new properties and methods to the Array() object.

When adding a property, all array objects will be given the property, and its value, as default.

When adding a method, all array objects will have this method.

Array.prototype refers to the Array class itself.

Syntax 

Array.prototype.name = value

Example

Make a new array method that transforms array values into upper case:

Demo

Array.prototype.myUcase = function() {
    var i;/*from www  .j  a  v a  2 s .co  m*/
    for (i = 0; i < this.length; i++) {
        this[i] = this[i].toUpperCase();
    }
};

var myArray = ["XML", "Json", "Database", "Mango"];
myArray.myUcase();
console.log( myArray );

Result