hi, can i defined a function which can be called like "diff{//do some}{// do some}" ?

# announcements

[Rick]

hi, can i defined a function which can be called like "diff{//do some}{// do some}" ?

[Kroppeb]

either diff({//do some},{// do some}) or diff({//do some}){// do some}

[Rick]

thx, i choose diff{}(){}

[Kroppeb]

That's not one of the options I gave, but if you really want that you can curry your function and do that, but I'd advise against it as it would come with some overhead.

[Burkhard]

The first syntax foo {}{} is actually possible, although it comes with some performance overhead and I would advice against it. The trick is that foo returns a function taking another lambda as it’s argument.
https://pl.kotl.in/NFoCKXcuP

[Kroppeb]

That does not compile.

[Kroppeb]

With currying (what you did) you can get (foo{}){} and foo{}(){} to work but not foo{}{}

[Burkhard]

wow after reloading the site it no longer does. I swear I just had it working.

[Burkhard]

I guess I mussed have imagined pressing run after changing (foo{}){} to foo{}{} . I would say too bad, but than I didn’t think it good style anyways.

[E.Kisaragi]

where question mark will have to be replaced with your types

[Kroppeb]

Are you sure, I can't seem to reproduce that. I'm pretty sure the max 1 lambda outside parentheses is an parser limitation.

[E.Kisaragi]

I thought we could🧐

[E.Kisaragi]

oh I couldn't either, sorry!

[Jordan Stewart]

you could use infix functions, e.g.

infix fun <T> (() -> T).diff(other: () -> T) {}
    
    fun doIt() {
        { "this" } diff { "that" }
    }