js split array into smaller arrays
Array.prototype.chunk = function(n) {
if (!this.length) {
return [];
}
return [this.slice(0, n)].concat(this.slice(n).chunk(n));
};
console.log([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15].chunk(5));