kotlin-stdlib/kotlin.text/isBlank

isBlank

expect fun CharSequence.isBlank(): Boolean(source)

Since Kotlin

1.0
actual fun CharSequence.isBlank(): Boolean(source)

Returns true if this string is empty or consists solely of whitespace characters.

Since Kotlin

1.1

Samples

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

fun main() { 
   //sampleStart 
   fun validateName(name: String): String {
    if (name.isBlank()) throw IllegalArgumentException("Name cannot be blank")
    return name
}

println(validateName("Adam")) // Adam
// validateName("") // will fail
// validateName("  \t\n") // will fail 
   //sampleEnd
}
actual fun CharSequence.isBlank(): Boolean(source)

Returns true if this string is empty or consists solely of whitespace characters.

Since Kotlin

1.0

Samples

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

fun main() { 
   //sampleStart 
   fun validateName(name: String): String {
    if (name.isBlank()) throw IllegalArgumentException("Name cannot be blank")
    return name
}

println(validateName("Adam")) // Adam
// validateName("") // will fail
// validateName("  \t\n") // will fail 
   //sampleEnd
}
actual fun CharSequence.isBlank(): Boolean(source)

Returns true if this string is empty or consists solely of whitespace characters.

Since Kotlin

1.3

Samples

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

fun main() { 
   //sampleStart 
   fun validateName(name: String): String {
    if (name.isBlank()) throw IllegalArgumentException("Name cannot be blank")
    return name
}

println(validateName("Adam")) // Adam
// validateName("") // will fail
// validateName("  \t\n") // will fail 
   //sampleEnd
}