How to use .pop in JavaScript code example

Example 1: javascript pop

var cars = ['mazda', 'honda', 'tesla'];
var telsa=cars.pop(); //cars is now just mazda,honda

Example 2: js array.pop

let cats = ['Bob'];

cats.unshift('Willy'); // ['Willy', 'Bob']

cats.unshift('Puff', 'George'); // ['Puff', 'George', 'Willy', 'Bob']