What is the difference between `{ stuff }()` and `...

# compiler

[Alexander Ioffe]

What is the difference between { stuff }() and run { stuff } in terms of performance. Are both of these constructs inlined or only the latter?

[ephemient]

it's easy to check for yourself

[ephemient]

well I guess one thing that is harder to check for yourself (unless you have older versions of the compiler around) is that this has changed over time…

[ephemient]

the old JVM backend doesn't inline the former (and the current compiler doesn't let you use -Xuse-old-backend anymore, so that's a bit tricky to test)

[ephemient]

the JVM IR backend does inline it, although that's not a documented behavior you can rely on AFAIK

[Alexander Ioffe]

Thanks!

[Youssef Shoaib [MOD]]

The run version is definitely more idiomatic though. The JS IIFE has no place in Kotlin.