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JavaScript Array prototype Constructor


Example

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

Array.prototype.myUcase = function() {
  for (i = 0; i < this.length; i++) {
    this[i] = this[i].toUpperCase();
  }
};

Make an array, then call the myUcase method:

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.myUcase();
Try it Yourself »

Definition and Usage

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

When constructing a property, ALL arrays will be given the property, and its value, as default.

When constructing a method, ALL arrays will have this method available.

Note: Array.prototype does not refer to a single array, but to the Array() object itself.

Note: Prototype is a global object constructor which is available for all JavaScript objects.


Browser Support

Property
prototype Yes Yes Yes Yes Yes

Syntax

Array.prototype.name = value

Related Pages

JavaScript Tutorial: JavaScript Arrays

JavaScript Tutorial: JavaScript Constructors