kotlin-stdlib/kotlin.text/toBooleanStrictOrNull

toBooleanStrictOrNull

fun String.toBooleanStrictOrNull(): Boolean?(source)

Returns true if the content of this string is equal to the word "true", false if it is equal to "false", and null otherwise.

There is also a lenient version of the function available on nullable String, String?.toBoolean. Note that this function is case-sensitive.

Since Kotlin

1.5

Samples

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

fun main() { 
   //sampleStart 
   println("true".toBooleanStrictOrNull()) // true
println("True".toBooleanStrictOrNull()) // null
println("TRUE".toBooleanStrictOrNull()) // null

println("false".toBooleanStrictOrNull()) // false
println("False".toBooleanStrictOrNull()) // null
println("FALSE".toBooleanStrictOrNull()) // null

println("abc".toBooleanStrictOrNull()) // null 
   //sampleEnd
}
xxxxxxxxxx
 
println("true".toBooleanStrictOrNull()) // true
println("True".toBooleanStrictOrNull()) // null
println("TRUE".toBooleanStrictOrNull()) // null
println("false".toBooleanStrictOrNull()) // false
println("False".toBooleanStrictOrNull()) // null
println("FALSE".toBooleanStrictOrNull()) // null
println("abc".toBooleanStrictOrNull()) // null 
Open in Playground →
Target: JVMRunning on v.2.1.20

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