javscript append item from array

var colors= ["red","blue"];
	colors.push("yellow"); //["red","blue","yellow"]var colors=["red","white"];
colors.push("blue");//append 'blue' to colorsvar fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.push("Kiwi");let foo = ['oop','plop','copo'];
	foo.push("plop");let chocholates = ['Mars', 'BarOne', 'Tex'];
let chips = ['Doritos', 'Lays', 'Simba'];
let sweets = ['JellyTots'];

let snacks = [];
snacks.concat(chocholates);
// snacks will now be ['Mars', 'BarOne', 'Tex']
// Similarly if we left the snacks array empty and used the following
snacks.concat(chocolates, chips, sweets);
//This would return the snacks array with all other arrays combined together
// ['Mars', 'BarOne', 'Tex', 'Doritos', 'Lays', 'Simba', 'JellyTots']