How to add item to end of an array code example

Example 1: js push array

var array = [];
var element = "anything you want in the array";
array.push(element); // array = [ "anything you want in the array" ]

Example 2: add item to array javascript

const arr1 = [1,2,3]
const newValue = 4
const newData = [...arr1, obj] // [1,2,3,4]