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7.8.7 push() and pop()

7.8.7 push() and pop()


The push() and pop() methods allow you to work with arrays as if they were stacks. The push() method appends one or more new elements to the end of an array and returns the new length of the array. The pop() method does the reverse: it deletes the last element of an array, decrements the array length, and returns the value that it removed. Note that both methods modify the array in place rather than produce a modified copy of the array. The combination of push() and pop() allows you to use a JavaScript array to implement 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

7.8 Array Methods | 151

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