javascript append array to end of array

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']
const new_array = old_array.concat([value1[, value2[, ...[, valueN]]]])var colors=["red","white"];
colors.push("blue");//append 'blue' to colorsvar hege = ["Cecilie", "Lone"];

var stale = ["Emil", "Tobias", "Linus"];

var kai = ["Robin"];

var children = hege.concat(stale, kai);