how I can create a type, that tpe contain String a...

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[Ifvwm]

how I can create a type, that tpe contain String and Int?

[karelpeeters]

You can't directly, either use Any or something like Either<Int, String> from #arrow.

[Ifvwm]

this arrow means?

[Ifvwm]

Either Int String is what I want, but I don't know how to do Left 3 or Right "3" in kotlin

[Ifvwm]

does kotlin have value constructor?

[kartoffelsup]

A Pair<Int, String> with 42 to "string"?

[Ifvwm]

no

[Ifvwm]

f :: Either Int String; f x = x; f (Left 3) will get Left 3, f (Right "S") will get Right "S"

[Ifvwm]

the function f's parameter type can be Int or String wrapped by Either

[Ifvwm]

it's about polymorphic, for example, f(x) if x is String, then make reverse x and return it, if x is Int, then plus one and return it

[Ifvwm]

x's type can be Int or String

[Ifvwm]

and we still can get 3 from (Left 3) by ff (Left x) = x

[Ifvwm]

now how to do that in kotlin?

[gildor]

You can just use Sealed classes, same way as it done in #arrow library

[karelpeeters]

@Ifvwm #arrow is just a library that has a class that handles what you want to do.