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kotlinlang

How to best make a conversion method with a default for the null receiver?

Currently, I have this:
```data class A(param: Int)
data class B(param: Int) {
  fun toA() = A(param)
}```
I want to make the converter work also on a nullable receiver providing some default value. I know I can do the following:
```data class B(param: Int)

fun B?.toA() = this?.let { A(param) } ?: A(42)```
but wonder whether there's a better option. At least if I can somehow keep the non-nullable `toA` inside the class definition (keeping its name) and refer to it in `fun B?.toA()`.

UPDATE: I realize now I can indeed refer to original `toA` from `B?.toA()` . Still it doesn't look very nice...

```fun B?.toA(): A = A(this?.param ?: DefaultValue)```

Hmm, that seems to be better only in the single param case IMO :disappointed:

Moreover, I'm maybe more interested in the option of keeping the converter inside the class def.

Yeah, that's not so horrible. As I said
&gt;  I'm maybe more interested in the option of keeping the converter inside the class def.
