kresult-core/io.kresult.core/KResult/mapFailure

mapFailure

inline fun <R> mapFailure(f: (E) -> R): KResult<R, T>

Maps (transforms) the failure value E to a new value R

import io.kresult.core.KResult
import io.kotest.matchers.shouldBe

fun test() {
  KResult.Failure(2)
    .mapFailure {
      it * it
    }
    .failureOrNull() shouldBe 4
}
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Parameters

f

transform the KResult.Success type T to R.