[Feature] Add get failure or null (#88)

.gitignore

@@ -21,9 +21,6 @@ local.properties
 .classpath
 .project
 
-# Bintray
-bintray_push.sh
-
 # Android Studio
 .idea/
 .gradle

result/src/commonMain/kotlin/com/github/kittinunf/result/Result.kt

@@ -16,6 +16,11 @@ fun <V, E : Throwable> Result<V, E>.getOrNull(): V? = when (this) {
     is Result.Failure -> null
 }
 
+fun <V, E : Throwable> Result<V, E>.getFailureOrNull(): E? = when (this) {
+    is Result.Success -> null
+    is Result.Failure -> error
+}
+
 inline infix fun <V, E : Exception> Result<V, E>.getOrElse(fallback: (E) -> V): V = when (this) {
     is Result.Success -> value
     is Result.Failure -> fallback(error)

result/src/commonTest/kotlin/com/github/kittinunf/result/ResultTest.kt

@@ -30,6 +30,24 @@ class ResultTest {
         assertEquals(Kind.Failure, v.kind)
     }
 
+    @Test
+    fun `should get return value and get failure return null for result with success`() {
+        val s = Result.of<Int, IllegalStateException> { 42 }
+
+        assertNull(s.getFailureOrNull())
+        assertNotNull(s.getOrNull())
+        assertEquals(42, s.getOrNull())
+    }
+
+    @Test
+    fun `should get return null and get failure return error for result with failure`() {
+        val f = Result.of<String, IllegalStateException> { throw IllegalStateException("foo") }
+
+        assertNull(f.getOrNull())
+        assertNotNull(f.getFailureOrNull())
+        assertIs<IllegalStateException>(f.getFailureOrNull())
+    }
+
     @Test
     fun `should create value with success`() {
         val s = Result.success(42)
@@ -46,7 +64,6 @@ class ResultTest {
         val e = Result.failure(RuntimeException())
         val err = e.component2()
 
-        assertNull(e.getOrNull())
         assertNull(e.component1())
         assertNotNull(err)
     }