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kotlinlang

Hi,
as any one encounter this type of class def and can explain the pattern
```Class A cosntructor(...) : (String) -&gt; B {

}```

it's a class that implements the `(String) -&gt; B` interface (you can think of it like `Function&lt;String, B&gt;` from Java).

What would be a good use case for that? or a pattern ?

That's difficult to answer. Basically when you want a function type that has state. Whether that makes much sense is up for debate, but could possibly be necessary to work around libraries/APIs that don't envision your use case.

OK, i looked on the Function interface it is indeed in order to force apply impel. probably sort of Command Pattern