array merge + javascript code example

Example 1: combine two arrays javascript

let arr1 = [0, 1, 2];
let arr2 = [3, 5, 7];
let primes = arr1.concat(arr2);

// > [0, 1, 2, 3, 5, 7]

Example 2: js join two arrays

[1,2,3].concat([4,5,6])
// [1,2,3,4,5,6]