How to merge and shuffle array of arrays

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();

score 7 · Accepted Answer · edited May 23 '17 at 12:18

7

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 -

edited May 23 '17 at 12:18

Community

1
1

answered Oct 10 '12 at 21:30

Selvakumar Arumugam

79,297
15
120
134

score 1 · Answer 2 · answered Oct 10 '12 at 21:31

1

$.merge( a[0], b );
$.merge( a[2], b );

answered Oct 10 '12 at 21:31

David G

94,763
41
167
253

score 1 · Answer 3 · answered Oct 10 '12 at 21:33

1

You do not need jQuery specific function to do this

Look at http://w3schools.com/jsref/jsref_concat_array.asp

answered Oct 10 '12 at 21:33

Joshua Wooward

1,508
2
10
12

score 0 · Answer 4 · answered Oct 10 '12 at 21:37

0

"Shuffling" is pretty simple:

var arry = [0,1,2,3,4,5,6,7,8,9];
arry.sort(function(a,b){
    return Math.random() * 2-1;
});

answered Oct 10 '12 at 21:37

Shmiddty

13,847
1
35
52

It'll work with any array of anything, but it's only pseudo random and consecutive "shuffles" have no effect since `Math.random()` is time-based – Shmiddty Oct 10 '12 at 21:42

How to merge and shuffle array of arrays

4 Answers4