Use named arguments in unit tests

src/main/kotlin/com/mikebull94/result/Iterable.kt

@@ -20,7 +20,10 @@ inline fun <T, R, E> Iterable<T>.fold(
     return ok(accumulator)
 }
 
-inline fun <T, R, E> List<T>.foldRight(initial: R, operation: (T, acc: R) -> Result<R, E>): Result<R, E> {
+inline fun <T, R, E> List<T>.foldRight(
+    initial: R,
+    operation: (T, acc: R) -> Result<R, E>
+): Result<R, E> {
     var accumulator = initial
 
     if (!isEmpty()) {

src/main/kotlin/com/mikebull94/result/Map.kt

@@ -26,7 +26,10 @@ inline fun <V, E, U> Result<V, E>.mapError(transform: (E) -> U): Result<V, U> {
  * - Elm: [Result.Extra.mapBoth](http://package.elm-lang.org/packages/circuithub/elm-result-extra/1.4.0/Result-Extra#mapBoth)
  * - Haskell: [Data.Either.either](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Either.html#v:either)
  */
-inline fun <V, E, U> Result<V, E>.mapBoth(success: (V) -> U, failure: (E) -> U): U {
+inline fun <V, E, U> Result<V, E>.mapBoth(
+    success: (V) -> U,
+    failure: (E) -> U
+): U {
     return when (this) {
         is Ok -> success(value)
         is Error -> failure(error)
@@ -38,11 +41,11 @@ inline fun <V, E, U> Result<V, E>.mapBoth(success: (V) -> U, failure: (E) -> U):
  * - Haskell: [Data.Bifunctor.Bimap](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Bifunctor.html#v:bimap)
  */
 inline fun <V1, V2, E1, E2> Result<V1, E1>.mapEither(
-    okTransform: (V1) -> V2,
-    errorTransform: (E1) -> E2
+    success: (V1) -> V2,
+    failure: (E1) -> E2
 ): Result<V2, E2> {
     return when (this) {
-        is Ok -> ok(okTransform(value))
-        is Error -> error(errorTransform(error))
+        is Ok -> ok(success(value))
+        is Error -> error(failure(error))
     }
 }

src/test/kotlin/com/mikebull94/result/MapTest.kt

@@ -58,8 +58,8 @@ internal class MapTest {
     @Test
     internal fun `mapBoth should return the transformed result value if ok`() {
         val value = ok("there is").mapBoth(
-            { "$it a light" },
-            { MapError.CustomError("$it that never") }
+            success = { "$it a light" },
+            failure = { MapError.CustomError("$it that never") }
         ) as String
 
         assertThat(value, equalTo("there is a light"))
@@ -68,8 +68,8 @@ internal class MapTest {
     @Test
     internal fun `mapBoth should return the transformed result error if not ok`() {
         val error = error(MapError.CustomError("this")).mapBoth(
-            { "$it charming" },
-            { MapError.CustomError("${it.reason} man") }
+            success = { "$it charming" },
+            failure = { MapError.CustomError("${it.reason} man") }
         ) as MapError.CustomError
 
         assertThat(error.reason, equalTo("this man"))
@@ -78,8 +78,8 @@ internal class MapTest {
     @Test
     internal fun `mapEither should return the transformed result value if ok`() {
         val result = ok(500).mapEither(
-            { it + 500 },
-            { MapError.CustomError(it) }
+            success = { it + 500 },
+            failure = { MapError.CustomError(it) }
         )
 
         result as Ok
@@ -90,8 +90,8 @@ internal class MapTest {
     @Test
     internal fun `mapEither should return the transformed result error if not ok`() {
         val result = error("the reckless").mapEither(
-            { "the wild youth" },
-            { MapError.CustomError("the truth") }
+            success = { "the wild youth" },
+            failure = { MapError.CustomError("the truth") }
         )
 
         result as Error