JSFiddle - React, Tailwind, and code Playground
JavaScript
var Mycollection1 = new Array("James", "Jonh", "Mary");
var Mycollection2 = Mycollection.slice();
Mycollection1.pop();
console.log(Mycollection1.toString()) // ["James","Jonh"]
console.log(Mycollection2.toString()) // ["James","Jonh", "marry"]