underscore.js - Equivalent of Ruby Enumerable#each_slice in Javascript?

Question

I am looking for an equivalent of Ruby's Enumerable#each_slice in Javascript.

I am already using the great underscore.js that has each(), map(), inject()...

Basically, in Ruby this great method does this :

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10].each_slice(3) {|a| p a}

# outputs below
[1, 2, 3]
[4, 5, 6]
[7, 8, 9]
[10]

Answer 1

How about this:

Array.prototype.each_slice = function (size, callback){
  for (var i = 0, l = this.length; i < l; i += size){
    callback.call(this, this.slice(i, i + size));
  }
};

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10].each_slice(3, function (slice){
  console.log(slice);
});

Output (in Node.js):

[ 1, 2, 3 ]
[ 4, 5, 6 ]
[ 7, 8, 9 ]
[ 10 ]