takes a large array, splitting into an array of arrays based on chunkSize

gistfile1.txt

Array.prototype.chunk = function (chunkSize) {
    var array = this;
    return [].concat.apply([],
        array.map(function (elem, i) {
            return i % chunkSize ? [] : [array.slice(i, i + chunkSize)];
        })
    );
}

Takes a large array and creates sets of arrays by chunk size. If you don't like patching Array, just assign const chunk = function ...