JavaScript Dynamic Arguments

Question

Just curious. Is there a simpler/better way to write the following code? I need just two arguments options and callback. The function may be called without any argument, with just callback, or with an options hash and callback.

function () {
  if (typeof arguments[0] === "function") {
    callback = arguments[0];
  } else if (arguments[0] && typeof arguments[0] === "object" && typeof arguments[1] === "function") {
    options = arguments[0];
    callback = arguments[1];
  }
  ...
  ...

}

Your `else if` part misses a `typeof` check on `arguments[1]` — Matteo Tassinari, Dec 06 '13 at 16:37
possible duplicate of [How to overload functions in javascript?](http://stackoverflow.com/questions/10855908/how-to-overload-functions-in-javascript) — Travis J, Dec 16 '13 at 20:09

score 2 · Answer 1 · answered Dec 06 '13 at 16:38

2

function (options, callback) {
  if (typeof options === "function") {
    callback = options;
    options = {};
  }
  // code
}

answered Dec 06 '13 at 16:38

Mykyta Shyrin

312
1
14

But it does not check whether options is a hash, when callback is a function. – Geordee Naliyath Dec 06 '13 at 16:42

JavaScript Dynamic Arguments

1 Answers1