Any idea how can I do a `getOrElse` on my `ResultW...

# announcements

[Joan Colmenero]

Any idea how can I do a getOrElse on my ResultWrapper class?

sealed class ResultWrapper<out T> {
    data class Success<out T : Any>(val value: T) : ResultWrapper<T>()
    data class Failure<out T : Any>(val failure: Throwable) : ResultWrapper<T>()

    inline fun <B> fold(ifFailure: (Throwable) -> B, ifSuccess: (T) -> B): B =
        when (this) {
            is Failure -> ifFailure(failure)
            is Success -> ifSuccess(value)
        }

    companion object {
        fun <T : Any> just(t: T): ResultWrapper<T> = Success(t)
        fun <T : Any> raise(t: Throwable): ResultWrapper<Throwable> = Failure(t)
    }
}

I'm getting a Success(value=MyModel(....))
And I need to do an Assert.assertEquals(expectedResult, result) where expectedResult is MyModel and Result is Success(value=MyModel(....)) .
Any idea?

[diesieben07]

val valueOrDefault = result.fold({ defaultValue }, { it })
Or you can write a helper function:

inline fun <T> ResultWrapper<T>.getOrDefault(defaultValue: (err: Throwable) -> T): T {
  return fold(defaultValue, {it})
}

[Joan Colmenero]

The thing is that I can not call this getOrDefault

[Joan Colmenero]

Looks like it's not visible... I can do a fold tho

[diesieben07]

Not sure what you mean.

[diesieben07]

You have to implement this function first.

[Joan Colmenero]

which function?

[diesieben07]

The one I showed above

[Joan Colmenero]

Yes, I did it, the thing is that I can do `result.fold()`but no result.getOrDefault I do not know why

[diesieben07]

Can you show your code?

[wbertan]

Curious, why can’t use the Result from Kotlin?!

[wbertan]

Or look in how they tackle these methods in Result extensions?!

[streetsofboston]

Would this work:
Assert.assertEquals(ResultWrapper.just(expectedResult), result) ?

[Joan Colmenero]

@streetsofboston sure it would work, but the idea is having the model itself, it looks to me like a hacky way

[Joan Colmenero]

That's why I wanted a getOrNull or getOrDefault method to get the model inself

[streetsofboston]

I don’t think it is hacky… You get a result, which is a ResultWrapper, which you assert with the expected value that also should be a `ResultWrapper`…

[Joan Colmenero]

Yes, that was not my intention, I meant it's an option and it works, but I'm looking for a getOrDefault solution, thank you though

[wbertan]

Maybe it is easier for you to write your own assert?! As I suspect is for your tests?!

@Test
    fun asas() {
        val expectedResult = "asas"
        val result: ResultWrapper<String> = ResultWrapper.just("asas")
        assertEquals(expectedResult, result)
    }

    private inline fun <reified T : Any> assertEquals(expectedResult: T, result: ResultWrapper<T>) {
        when (result) {
            is ResultWrapper.Success<*> -> org.junit.Assert.assertEquals(expectedResult, result.value)
            is ResultWrapper.Failure<*> -> org.junit.Assert.assertEquals(expectedResult, result.failure)
        }
    }