return an array with two arrays javascript code example

Example 1: js combine two arrays

const letters = ['a', 'b', 'c'];
const numbers = [1, 2, 3];

letters.concat(numbers);
// result in ['a', 'b', 'c', 1, 2, 3]

Example 2: return two arrays javascript

this.runThisFunctionOnCall = function(){
    var array1 = [11,12,13,14,15];
    var array2 = [21,22,23,24,25];
    var array3 = [31,32,33,34,35];

    return [
     array1,
     array2,
     array3
    ];
}