Javascript [Electronic resources] : The Definitive Guide (4th Edition) نسخه متنی

Availability

JavaScript 1.2; JScript 3.0; ECMAScript v3

Synopsis

array.slice(start, end)

Arguments

start

The array index at which the slice is to begin. If negative, this
argument specifies a position measured from the end of the array.
That is, -1 indicates the last element, -2 indicates the second from
last element, and so on.

end

The array index immediately after the end of the slice. If not
specified, the slice includes all array elements from the
start to the end of the array. If this
argument is negative, it specifies an array element measured from the
end of the array.

Returns

A new array that contains the elements of
array from the element specified by
start, up to, but not including, the
element specified by end.

Description

slice( ) returns a slice, or subarray, of
array. The returned array contains the
element specified by start and all
subsequent elements up to, but not including, the element specified
by end. If end
is not specified, the returned array contains all elements from the
start to the end of
array.

Note that slice( ) does not modify the array. If
you want to actually remove a slice of an array, use
Array.splice( ).

Example

var a = [1,2,3,4,5];
a.slice(0,3);    // Returns [1,2,3]
a.slice(3);      // Returns [4,5]
a.slice(1,-1);   // Returns [2,3,4]
a.slice(-3,-2);  // Returns [3]; buggy in IE 4: returns [1,2,3]

Bugs

start cannot be a negative number in
Internet Explorer 4.

See Also

Array.splice( )