I have a lambda and I m trying to have it return null from w kotlinlang #announcements

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Title

m

Michael

02/07/2019, 8:11 PM

I have a lambda and I’m trying to have it return null from within an if statement; but it seems that it just exits the if and moves on to the last line:

{ .....some lines.... if (condition) { null } ..... final value }

d

Dominaezzz

02/07/2019, 8:12 PM

You'll need to do

if (condition) { null } else { ..... final value }

I think.

☝️ 1

k

karelpeeters

02/07/2019, 8:12 PM

Or use

return@foo null

.

m

Michael

02/07/2019, 8:23 PM

👍🏼 Thanks. That got me working.

the different syntax between functions and lambdas always gets me a little bit.

g

groostav

02/07/2019, 9:06 PM

Yeah I dont blame you, would be nice of the compiler could flag

if(condition) { null } otherValue

as failing to compile with a compiler error something along the lines of

if(...) { null }
, using
null
without a parent statement is illegal in this context. Either assign the expression to a value, return it, or simply invoke the condition.

is there no intelliJ inspection for same as suspicious? I know that

if(condition)

is a problem because

condition

may have side effects, but

if(ANY_EXPR) { CONSTANT_EXPR }

is odd even if

ANY_EXPR

has a side effect when

CONSTANT_EXPR

is unused --and of course, in the overwhelming majority of cercomstances, people use

ANY_EXPR

as being ref-transparent, so the whole thing is almost certainly not what the programmer wanted.

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