In general, you can do this via `arguments.length`, and if/once the pattern
matching proposal [1] hits stage 4, you could do this to emulate it very
closely:
```js
function foo(...args) {
case (args) {
when [] -> { /* zero args*/ },
when [x] -> { /* one arg */ },
// and so on...
}
}
```
In general, that proposal would most interest you.
[1]:
https://github.com/tc39/proposal-pattern-matching
On Wed, Oct 17, 2018 at 01:24 bishwendu kundu <[email protected]>
wrote:
> Hello All,
>
> I have been a great fan of the evolution of JavaScript in the recent past.
> The language is steadily closing the gap to ideal functional paradigm. One
> of the things that I have liked the most about languages like
> Erlang/Elixir/Haskell is their ability to define functions with same name
> and different airty. The decision of invoking the correct function-argument
> pattern is dependent on the invocation of the function. Implicit pattern
> matching in aforementioned languages helps avoid costly cognitive loads
> introduced by explicit if/else based pattern of logic flow branching.
>
> The greatest power of the pattern matching which amazed me was, dropping
> the whole of looping construct, altogether. Elixir/Erlang have no LOOPS.
> Stack based recursive calls combined with JavaScript's closures suddenly
> strikes me as a very powerful programming model that not only increases
> readability of code but also promotes immutability of the data structures
> in use. The loops would continue to exist but more modern codes can be
> written leveraging the recursive model of JavaScript.
>
> With de-structuring of arrays & objects already in place in JavaScript,
> pattern-matching of functions can fit right in perfectly, thereby taking
> JavaScript another step closer to ideal functional programming model.
>
> Looking forward to your response.
>
> Thanks & Regards,
> Bishwendu.
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>
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