I have this method: `fun click(onClick: ((v: View)...

# getting-started

[rockerhieu]

I have this method: fun click(onClick: ((v: View) -> Unit)? = null) {}
What is the correct syntax for describing click(if (condition) null else <a lambda>)

[voddan]

rockerhieu: That is the correct syntax

[rockerhieu]

I could make it work

[rockerhieu]

*couldn't

[voddan]

click(if (1 == 1) null else {}) must work

[voddan]

if it doesn't , then post the error messages and we will look at them

[forcelain]

this will work

val r: ((View) -> Unit)? = if (true) null else { view -> println(view) }
click(r)

[rockerhieu]

Here is the error http://imgur.com/a/gvyr6

[rockerhieu]

@forcelain that what I did as a workaround, but I'd expect @voddan 's suggestion should work also

[forcelain]

I see 2 problems here: 1) it’s not obvious for the compiler if bracers in else {} is a lambda or just a statement bracers 2) you should explicitly specify that null is ((v: View) -> Unit)?

[forcelain]

so, this also works

click(
            if (true) {
                null as ((v: View) -> Unit)?
            } else {
                { }
            })

[rockerhieu]

Interesting, it works, thanks @forcelain. Although the IDE suggested me to remove the useless cast, but without the explicitly cast it doesn't work

[forcelain]

yep

[voddan]

Strangely enough nothing that makes sense works in this situation. Could you report it to youtrack.jetbrains.com/issues/KT please?

[rockerhieu]

Sure, doing

[rockerhieu]

someone already reported it https://youtrack.jetbrains.com/issue/KT-15487