arrayTo2d.js

function arrayTo2d(items, width) {
	var rows = [];
	var lastRow;

	items.forEach(function(item, i) {
		// add another row when cell index is divisble by width
		if ((i) % width === 0) {
			lastRow = [];
			rows.push(lastRow);
		}

		lastRow.push(item);
	});

	return rows;
}