JavaScript: The Definitive Guide, 5th Edition

Name

Array.pop( ): remove and return the last element of an array — ECMAScript v3

Synopsis

array.pop( )

Returns

The last element of array.

Description

pop( ) deletes the last element of array, decrements the array length, and returns the value of the element that it deleted. If the array is already empty, pop( ) does not change the array and returns the undefined value.

Example

pop( ), and its companion method push( ), provide the functionality of a first-in, last-out stack. For example:

var stack = [];       // stack: []
stack.push(1, 2);     // stack: [1,2]     Returns 2
stack.pop( );            // stack: [1]       Returns 2
stack.push([4,5]);      // stack: [1,[4,5]] Returns 2
stack.pop( )             // stack: [1]       Returns [4,5]
stack.pop( );            // stack: []        Returns 1

See Also

Array.push( )