hi i have a strange behavior from Kotlin both Int...

# announcements

[althaf]

hi i have a strange behavior from Kotlin both IntellJ Community Edition and Android Studio is using Kotlin 1.5 ,

var paymentMethod: String? = null
var result = paymentMethod?.takeIf { !it.isNullOrBlank() } ?: let { "-" }
println("output " + result)

The let part is working fine is android studio . However it is showing error in Community Edition. Is this expected or some strange behavior ?

[rnett]

Seems like IntelliJ is correct there, let (from the stdlib, unless you have another one defined) has a receiver that isn't present there. Does it compile and run fine?

[althaf]

yes on Android Studio it is working

[althaf]

i'm able to run as well

[Tobias Berger]

it should be able to run if there is a this present at that point. Otherwise there is nothing that could be used as a receiver for let.
But anyways, that let makes no sense, just use ?: "-" directly. If you need more than one expression, I suggest using run instead or even extract that to another function.

[althaf]

@Tobias Berger ah i get it now, in android studio the let code i gave was inside another lambda , so let was referring the the hosting lambda. Where as in Intellj it was in the main function.

[althaf]

private fun getDefaultValueIfNotNullOrEmpty(value: String?): String {
    return value?.takeIf { !it.isNullOrBlank() } ?: "-"
}

[althaf]

from your input this did the trick Thank you @rnett and @Tobias Berger

[Tobias Berger]

just another hint: inside the lambda you don't need to check for null, because the ? already takes care of that.
And for some syntactic sugar, you could also write that like this:

private fun String?.orDefault() = this?.takeUnless { it.isBlank() } ?: "-"

and then just call

value.orDefault() // no "?" !

[althaf]

Noted , thank you