Implement shuffle-array utility library

[kgish]

import Ember from 'ember';

function shuffleArray(array) {
    var m = array.get('length'),
        shuffled_n = [], shuffled_array = Ember.A();

    for (var i = 0; i < m; i++) {
        shuffled_n.push(i);
    }
    shuffled_n = shuffle(shuffled_n, m);

    // Use shuffled array of digits to randomize array object elements
    for (i = 0; i < m; i++) {
        shuffled_array.pushObject(array.objectAt(shuffled_n[i]));
    }

    return shuffled_array;
}

// Shuffle array of digits
function shuffle(n, m) {
    var t, i;

    // While there remain elements to shuffle
    while (m) {

        // Pick a remaining element
        i = Math.floor(Math.random() * m--);

        // And swap it with the current element.
        t = n[m];
        n[m] = n[i];
        n[i] = t;
    }
    return n;
}

export {
    shuffleArray
};