Array.prototype : prototype « Array « JavaScript Tutorial

Syntax

Array.prototype.property
    Array.prototype.method

The prototype property allows you to add new properties and methods to the Array object that can be used throughout your code.

The following example assigns a new method to the array object with the prototype property.

<html>
    <script language="JavaScript">
    <!--
    function pop()
    {
      if(this.length != 0)
      {
        var lastElement = this[this.length-1];  
        this.length = this.length-1;            
        return(lastElement);
      }
    }
    //Make the pop() function available to all Array objects
    //This will override the pop() method provided by the Array object in Netscape
    Array.prototype.pop = pop;

    var flavorArray = new Array("A","B","C");
    document.write(flavorArray.join(', '),"<br>");

    var removedElement = flavorArray.pop();
    document.write(removedElement," was removed from the flavor array.<br>");

    document.write("new array: ");
    document.write(flavorArray.join(', '),"<br>");

    -->
    </script>
    </html>

11.21.prototype
	11.21.1.	Array.prototype