JavaScript: The Definitive Guide, 6th Edition

Name

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

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()