< arekolek> There s this issue that s WIP it s also about sm kotlinlang #announcements

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Title

k

karelpeeters

08/21/2017, 11:45 AM

@arekolek There's this issue that's WIP, it's also about smart casts and inline functions: https://youtrack.jetbrains.com/issueMobile/KT-14397

👍 1

a

arekolek

08/21/2017, 11:52 AM

Thanks. I was thinking about things like

foo.takeIf { it is Foo }

for those cases where

foo

is a “property with an open or custom getter”

But I can write

foo.let { if (it is Foo) }

which is not too bad

l

lovis

08/21/2017, 12:17 PM

write your own:

inline fun <reified T> Any.takeIfInstance() = this.takeIf { it is T } as? T

should work call it

val astring = myObj.takeIfInstance<String>()

k

karelpeeters

08/21/2017, 12:18 PM

Hmm that rings a bell, doesn't something like that exists already?

Maybe for filtering collections.

l

lovis

08/21/2017, 12:18 PM

yes there is

filterIsInstance

and
mapIsInstance
(must have dreamt about the last one)

i

ilya.gorbunov

08/22/2017, 7:32 AM

just use

foo as? Foo

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