if in list add one javascript code example

Example 1: append array js

var colors= ["red","blue"];
	colors.push("yellow"); //["red","blue","yellow"]

Example 2: how to push an element into an array in javascript

// initialize array
var arr = [
  "Hi",
  "Hello",
  "Bonjour"
];

// append new value to the array
arr.push("Hola");

console.log(arr);