Popping and pushing in JavaScript

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push() is used to add an element/item to the end of an array. The pop() function is used to delete the last element/item of the array. Let's try to add and remove elements from an array using push() and pop() methods to understand these methods better.

https://www.c-sharpcorner.com/article/working-with-array-in-javascript/

The push() is used to add an element/item to the end of an array.

The pop()  is used to delete the last element/item of the array.

How to use the pop() method in JavaScript

Suppose we have an array of numbers and we want to remove the last element from it. The code from removing an element from the end of the array would go like this:

var intArr = [23, 45, 67];
intArr.pop(); // returns the removed item
console.log(intArr);

How to use the push() method in JavaScript

Similarly, if we want to add an element at the end of an array, the code for pushing or adding an element would go like this:

var intArr = [23, 45];
intArr.push(67); // returns the new array length
console.log(intArr);

Note: 

The pop() method in JavaScript removes an item from the end of an array, whereas the push() method adds an item to the end of an array. The returning value of the pop() method is the item that is removed from the array.