ifBlank

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

Returns this char sequence if it is not empty and doesn't consist solely of whitespace characters, or the result of calling defaultValue function otherwise.

Since Kotlin

1.3

Samples

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

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

val blankOrNull: String? = blank.ifBlank { null }
println(blankOrNull) // null

val blankOrDefault = blank.ifBlank { "default" }
println(blankOrDefault) // default

val nonBlank = "abc"
val sameString = nonBlank.ifBlank { "def" }
println("nonBlank === sameString is ${nonBlank === sameString}") // true 
   //sampleEnd
}
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val blank = "    "
val blankOrNull: String? = blank.ifBlank { null }
println(blankOrNull) // null
val blankOrDefault = blank.ifBlank { "default" }
println(blankOrDefault) // default
val nonBlank = "abc"
val sameString = nonBlank.ifBlank { "def" }
println("nonBlank === sameString is ${nonBlank === sameString}") // true 
Open in Playground →
Target: JVMRunning on v.2.1.20

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