given an array, return an array of arrays with {{chunkSize}} elements

UtilityService.cfc

component {

	// given an array, return an array of arrays with {{chunkSize}} elements
	function chunk (required array input, required numeric chunkSize) {
		var output[1] = [];
		var idx = 1;
		input.each((item, index) => {
			output[idx].append(item);
			if(index % chunkSize == 0 && index < input.len()) output[++idx] = [];
		})
		return output;
	}

}