monkjack - 7 months ago 33

Scala Question

Since a total function is a special case of a partial function, I think I should be able to return a function when I need a partial.

Eg,

`def partial : PartialFunction[Any,Any] = any => any`

Of course this syntax fails to compile. My question is, is it possible to do this, and if so what do I need to do to get the syntax right.

I know I can do the following, but this is just an out-of-curiousity-question

`def partial : PartialFunction[Any,Any] = {`

case any => any

}

Answer

You could use `PartialFunction.apply`

method:

```
val partial = PartialFunction[Any,Any]{ any => any }
```

You could import this method if you want to make it shorter:

```
import PartialFunction.{apply => pf}
val partial = pf[Any,Any]{ any => any }
```