Duplicate an array an arbitrary number of times (javascript)

Question

Let\'s say I\'m given an array. The length of this array is 3, and has 3 elements:

var array = [\'1\',\'2\',\'3\'];

Eventually I will need

Answer 1

The simplest solution is often the best one:

function replicate(arr, times) {
     var al = arr.length,
         rl = al*times,
         res = new Array(rl);
     for (var i=0; i

(or use nested loops such as @UsamaNorman).

However, if you want to be clever, you also can repeatedly concat the array to itself:

function replicate(arr, times) {
    for (var parts = []; times > 0; times >>= 1) {
        if (times & 1)
            parts.push(arr);
        arr = arr.concat(arr);
    }
    return Array.prototype.concat.apply([], parts);
}