how to add elements of one array to another in javascript code example

Example 1: add array to array javascript

// SPREAD OPERATOR
 const list1 = ["pepe", "luis", "rua"];
 const list2 = ["rojo", "verde", "azul"];
 const newList = [...list1, ...list2];
 // ["pepe", "luis", "rua", "rojo", "verde", "azul"]

Example 2: javascript Inserting values in between an array

myArray.splice(index, itemsToDelete, item1ToAdd, item2ToAdd, ...)

Example 3: javascript push all elements of array to another array

var arrayA = [1, 2];
var arrayB = [3, 4];
var newArray = arrayA.concat(arrayB);