refactor: Add okOption, errOption

Author: MarcellPerger1

src/main/java/net/marcellperger/mathexpr/util/rs/Result.java

@@ -68,6 +68,12 @@ static <T, E> Result<T, E> newErr(E err) {
     default Optional<Ok<T, E>> okOpt() { return Optional.ofNullable(ok()); }
     default Optional<Err<T, E>> errOpt() { return Optional.ofNullable(err()); }
 
+    default Option<T> okOption() {
+        return mapOr(Option.newNone(), Option::newSome);
+    }
+    default Option<E> errOption() {
+        return ifThenElse(_ok -> Option.newNone(), Option::newSome);
+    }
 
     default boolean isOk() { return ok() != null; }
     default boolean isErr() { return err() != null; }

src/test/java/net/marcellperger/mathexpr/util/rs/ResultTest.java

@@ -430,4 +430,16 @@ void errOpt() {
         assertEquals(Optional.empty(), getOk().errOpt());
         assertEquals(Optional.of(new Err<>("TESTING_ERROR")), getErr().errOpt());
     }
+
+    @Test
+    void okOption() {
+        assertEquals(Option.newSome(314), getOk().okOption());
+        assertEquals(Option.newNone(), getErr().okOption());
+    }
+
+    @Test
+    void errOption() {
+        assertEquals(Option.newNone(), getOk().errOption());
+        assertEquals(Option.newSome("TESTING_ERROR"), getErr().errOption());
+    }
 }