Returns undefined if the array is empty. First, we create two classes, one is the ExampleClass1, and the other is StackPushPopExample, in which we create the logic for push and pop operations in the stack. Maybe try searching? In the next step, the value which is at the top of the Stack will be popped out . Example: The push () method: takes an int parameter type and adds it to the first position of the list we created. These are push() and pop() methods. unshift returns the new length of the array. Then, print the elements. arr [2] is a function. Below examples illustrate the JavaScript Array push () method: Example 1: In this example the function push () adds the numbers to the end of the array. log ( numbers ); // [1, 2, 3, 4, 5, 6] console. The following example uses an ArrayList to implement a stack. one less than it's current value. Lets look at some examples to demonstrate the use of pop. Starting position of a given value is determined by the property length. The push() method is represented by the following syntax: In Javascript, push() is a method that helps in adding one or more than one elements to an arrays end. Explanation: Similar to example 2, start the script by using the tag