##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
Combining arrays
Join arrays together with concat():
let a = [1, 2]
let b = [3, 4]
let c = a.concat(b)
console.log(c) // [1, 2, 3, 4]
console.log(a) // [1, 2] (unchanged)
// Multiple arrays and values
let d = a.concat(b, [5, 6], 7)
console.log(d) // [1, 2, 3, 4, 5, 6, 7]
concat() returns a new array. The originals are unchanged.