Iterate arrays

iterate-arrays.js

(function(cb, ...params) {
	const last = params.length - 1;
	const count = params[last] - 1;

	function iterate(c, values) {
		params[c].forEach(function(item) {
            		if (c === count) {
                		cb(...values, item);
            		} else {
                		iterate(c + 1, [...values, item]);
            		}
        	});
	}

	iterate(0, []);
})(console.log, [1,2,6,7], [3,4,5], [8,9], 3)