JavaScript Pocket Reference

Array

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JavaScript Pocket Reference

Array

array creation and manipulation

Core JavaScript 1.1; JScript 2.0; ECMA v1

Constructor

new Array() // empty

new Array(n) // n undefined elements

new Array(e0, e1,...) // specified elements

Literal Syntax

In JavaScript 1.2, JScript 3.0, and ECMA v3, you can create and

initialize an array by placing a comma-separated list of expres-

sions within square brackets. The values of these expressions

become the elements of the array. For example:

var a = [1, true, 'abc'];

var b = [a[0], a[0]*2, f(x)];

Properties

length

A read/write integer specifying the number of elements in the

array, or, when the array does not have contiguous elements,

a number one larger than the index of the last element in the

array. Changing the value of this property truncates or

extends the array.

Methods

concat(value, ...)

Returns a new array, which is formed by concatenating each

of the specified arguments to this one. If any arguments to

concat() are themselves arrays, their elements are concate-

nated, rather than the arrays themselves. JS 1.2; JScript 3.0;

ECMA v3.

join(separator)

Returns the string that results from converting each element

of an array to a string and then concatenating the strings

together, with the

separator string between elements.

pop()

Removes and returns the last element of the array, decre-

menting the array length. JS 1.2; JScript 5.5; ECMA v3.

Array

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