Kotlin Result<Success,Failure> Example

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Language: Java

Posted by: usere4d07

Added: Nov 6, 2019 8:46 PM

Tags: kotlin

sealed class Result<out Success, out Failure>
data class Success<out Success>(val value: Success) : Result<Success, Nothing>()
data class Failure<out Failure>(val reason: Failure) : Result<Nothing, Failure>()
// Example
fun echoString(string : String) : Result<String, Exception> {
return if (string.isEmpty()) {
Failure(Exception("Error"))
} else {
Success(string)
}
}
fun main(args : Array<String>) {
when(val result = echoString("string")) {
is Success -> println(result.value)
is Failure -> println(result.reason)
}
}