how to append to a array in javascript code example

Example 1: javascript append array to array

const array1 = ['a', 'b', 'c'];
const array2 = ['d', 'e', 'f'];
const array3 = array1.concat(array2);

Example 2: append item to array javascript

arr.push(item);

Example 3: how to push items in array in javascript

let items = [1, 2, 3]
items.push(4); // items = [1, 2, 3, 4]

Example 4: javascript append array to end of array

const new_array = old_array.concat([value1[, value2[, ...[, valueN]]]])