How to randomize subset of array in Javascript?

Question

What is the best way to randomize part of the array in Javascript

For example, if I have 100 items in the array, what is the fast and efficient way of randomizing set of

Answer 1

I would just use the built in slice, concat and sort methods. Something like this.

function shuffle(arr, start, end) {
 return arr.slice(start, end).sort(function() { return .5 - Math.random(); }).concat(arr.slice(end));
};

That's the basic idea, you probably want to make an algorithm to slice every 10 elements, sort and rejoin the sets.

EDIT: Read comments below for why this solution may not be suitable for your needs.