Kotlin CharSequence.nullIfEmpty()

Language Design
1

Hello,

I find it weird that there is no method for converting an empty String(CharSequence) to null by default in the std.

value?.let {
if (it.isEmpty()) null
else it
}

There should be an extension to do this using something like:

value?.nullIfEmpty()

2

There’s an extension ifEmpty, where you can pass a value to be used instead of an empty string:

fun main() {
//sampleStart
val value: String? = ""
value?.ifEmpty { null }
//sampleEnd
.let(::println)
}
2 Likes
3

Additionally, you could also do a value.takeUnless { it.isEmpty() }

4

ifEmpty seems to be the best way to do this, I thought it might be a good inline extension as it is used so much

1 Like