Function overloading in Javascript best practises

Question

What are the best ways to fake a function overloading in Javascript?

Answer 1

The best way to do function overloading with parameters is not to check the argument length or the types. Checking the types would make your code slow.

What you can do is tack on an object as the last argument to their methods. This object can hold anything.

function fun(a, b, options) {

  // ...

  if (options['test']) { } //if test param exists, do something.. 

}

foo(1, 2, {"method":"mutiply"});

foo(3, 4, {"test":"equals", "bar":"fruit"});

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