Why does this code work ``` fun String?.whenNotNul...

# getting-started

[Viet Hoang]

Why does this code work

fun String?.whenNotNullOrEmpty(callback: (String) -> String?): String? {
    return if (this.isNullOrEmpty()) null
    else callback(this)
}

but this doesn’t ?

fun String?.whenNotNullOrEmpty(callback: (String) -> String?): String? {
    return if (isNullOrEmpty()) null
    else callback(this)
}

[spand]

Seems like a bug

[spand]

You should report it

[diesieben07]

https://youtrack.jetbrains.com/issue/KT-28672