Core Web Programming, Second Edition

25.1. The Array Object

In the first version of JavaScript, an array was implemented as a JavaScript object containing multiple property settings. Later, in JavaScript 1.1, an array was implemented as a separate Array object.

Constructors

new Array() This constructor builds a new zero-length array. Adding an element to a specified index automatically changes the length. For example,

var a = new Array();              // a.length = 0
a[12] = "foo";                    // a.length = 13

new Array(length) This constructor builds an array with indices from 0 to length-1. All the values will initially be null.

Note that this constructor is not properly recognized in Netscape's implementation of JavaScript 1.2 (Internet Explorer is fine); in Netscape this constructor produces an array ...