combine.js

var toList = function (value) {
  return Array.isArray(value) ? value : [value];
};

var range = function (from, to) {
  var result = [];
  for (var i = from; i <= to; i ++) {
    result.push(i);
  }

  return result;
};

var combine = function () {
  var args = Array.prototype.slice.call(arguments);
  var lists = args.map(toList);

  var first = lists.shift();
  var second = lists.shift();

  var result = [];
  for (var j = 0; j < first.length; j ++) {
    for (var i = 0; i < second.length; i ++) {
      result.push(String(first[j]) + String(second[i]));
    }
  }

  return lists.length === 0 ? result : combine.apply(this, [result].concat(lists));
};

console.log(combine('hoge', ['foo', 'bar'], range(1, 3)));
// => ["hogefoo1", "hogefoo2", "hogefoo3", "hogebar1", "hogebar2", "hogebar3"]