Function overloading in Javascript - Best practices

Question

What is the best way(s) to fake function overloading in Javascript?

I know it is not possible to overload functions in Javascript as in other languages. If I neede

Answer 1

If I needed a function with two uses foo(x) and foo(x,y,z) which is the best / preferred way?

The issue is that JavaScript does NOT natively support method overloading. So, if it sees/parses two or more functions with a same names it’ll just consider the last defined function and overwrite the previous ones.

One of the way I think is suitable for most of the case is follows -

Lets say you have method

function foo(x)
{
} 

Instead of overloading method which is not possible in javascript you can define a new method

fooNew(x,y,z)
{
}

and then modify the 1st function as follows -

function foo(arguments)
{
  if(arguments.length==2)
  {
     return fooNew(arguments[0],  arguments[1]);
  }
} 

If you have many such overloaded methods consider using switch than just if-else statements.