ifEmpty

inline fun <C : CharSequence, R, R> C.ifEmpty(defaultValue: () -> R): R(source)

Returns this char sequence if it's not empty or the result of calling defaultValue function if the char sequence is empty.

Since Kotlin

1.3

Samples

import java.util.Locale
import kotlin.test.*

fun main() { 
   //sampleStart 
   val empty = ""

val emptyOrNull: String? = empty.ifEmpty { null }
println(emptyOrNull) // null

val emptyOrDefault = empty.ifEmpty { "default" }
println(emptyOrDefault) // default

val nonEmpty = "abc"
val sameString = nonEmpty.ifEmpty { "def" }
println("nonEmpty === sameString is ${nonEmpty === sameString}") // true 
   //sampleEnd
}
xxxxxxxxxx
 
val empty = ""
val emptyOrNull: String? = empty.ifEmpty { null }
println(emptyOrNull) // null
val emptyOrDefault = empty.ifEmpty { "default" }
println(emptyOrDefault) // default
val nonEmpty = "abc"
val sameString = nonEmpty.ifEmpty { "def" }
println("nonEmpty === sameString is ${nonEmpty === sameString}") // true 
Open in Playground →
Target: JVMRunning on v.2.1.20

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