`out E` is where I started. See first snippet

# announcements

[iex]

out E is where I started. See first snippet

[iex]

oh your code compiles

[iex]

the fix is then to add E as generic parameter to the function?

[iex]

is that correct? It's supposed to be the same E from the instance

[streetsofboston]

It is removing the methods outside the sealed class and make them extension functions.

[streetsofboston]

E.g. this all works as well, calling/using your Result class:

fun testing() {
    val x = Result.Ok(5)
    val y = x.map { it * 2 }

    val z: Result<Int,String> = Result.Err("Error")
    val y2 = z.map { it + 4 }
    val y3 = z.mapError { it.length }

    val q: Result<String, Throwable> = x.flatMap { Result.Ok("$it") }
}

[streetsofboston]

BTW: I updated the code-snippet a little bit to make it create less objects https://kotlinlang.slack.com/archives/C0922A726/p1558032372083600

[iex]

awesome, will use this. Thank you!

[joelpedraza]

@iex You could also copy the stdlib Result and make it inline class

[joelpedraza]

Only the Err needs to be boxed

[joelpedraza]

Also, guessing by names you’re a rustacean? 🙂

[iex]

no 😄

[joelpedraza]

@iex heres mine
https://gist.github.com/joelpedraza/22be7db18fac4fa0cb213f31358f5ced

[iex]

thanks 👍

[joelpedraza]

inline allthethings