how to push the element of array to another array in javascript code example

Example 1: push elements of array to another array typescript

// Same array push
let arr1 = [0, 1, 2];
let arr2 = [3, 4, 5];
arr1.push(...arr2);

// New array push
let arr1 = [1, 2];
let arr2 = [3, 4];
let newArr = arr1.concat(arr2);

Example 2: javascript push all elements of array to another array

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