Question

Having array of arrays

var a = [[[1, "alpha", "a"],
          [2, "beta",  "b"]],
         [[3, "gama",  "c"]],
         [[4, "delta", "d"]]];

var b = [];

1) How can I merge a[0] and a[2] into b?

2) How can I shuffle array b?

---

This is a shuffle algorithm I am using >>

Array.prototype.shuffle = function() {
  for (var i = 0; i < this.length; i++)
    this.push(this.splice(Math.random() * (this.length - i), 1)[0]);
  return this;
}

with syntax

myArray.shuffle();

Answer 1

To merge you can simply use concat.

var b = a[0].concat(a[2]);

For shuffling you need to write your own shuffling logic. There is no API for such.

Shuffling –

• How can I shuffle an array?
• How to randomize (shuffle) a JavaScript array?