feat(option,result): add a map functionList method

option.go

@@ -153,6 +153,22 @@ func (o Option[T]) Map(mapper func(value T) (T, bool)) Option[T] {
 	return None[T]()
 }
 
+func (o Option[T]) Maps(mapperList ...func(value T) (T, bool)) Option[T] {
+	if !o.isPresent {
+		return None[T]()
+	}
+	tmpValue := o.value
+	for _, mapper := range mapperList {
+		var ok bool
+		tmpValue, ok = mapper(tmpValue)
+		if !ok {
+			return None[T]()
+		}
+	}
+
+	return Some(tmpValue)
+}
+
 // MapNone executes the mapper function if value is absent or returns Option.
 // Play: https://go.dev/play/p/_KaHWZ6Q17b
 func (o Option[T]) MapNone(mapper func() (T, bool)) Option[T] {

option_example_test.go

@@ -258,6 +258,34 @@ func ExampleOption_Map_none() {
 	// Output: false 0
 }
 
+func ExampleOption_Maps_some() {
+	some := Some(42)
+	result := some.Maps(
+		func(i int) (int, bool) {
+			return 1234, true
+		},
+		func(value int) (int, bool) {
+			return value + 1, true
+		},
+	)
+
+	fmt.Println(result.IsPresent(), result.OrEmpty())
+	// Output: true 1235
+}
+func ExampleOption_Maps_none() {
+	none := None[int]()
+	result := none.Maps(
+		func(i int) (int, bool) {
+			return 1234, true
+		},
+		func(value int) (int, bool) {
+			return value + 1, true
+		},
+	)
+
+	fmt.Println(result.IsPresent(), result.OrEmpty())
+	// Output: false 0
+}
 func ExampleOption_MapNone_some() {
 	some := Some(42)
 	result := some.MapNone(func() (int, bool) {

option_test.go

@@ -173,6 +173,43 @@ func TestOptionMap(t *testing.T) {
 	is.Equal(Option[int]{value: 0, isPresent: false}, opt2)
 }
 
+func TestOptionMaps(t *testing.T) {
+	is := assert.New(t)
+
+	mul2 := func(i int) (int, bool) {
+		return i * 2, true
+	}
+	inc1 := func(i int) (int, bool) {
+		return i + 1, true
+	}
+	returnFalse := func(i int) (int, bool) {
+		return 0, false
+	}
+	t.Run("maps 2 func ok ", func(t *testing.T) {
+		v := Some(21).Maps(mul2, inc1)
+		is.Equal(Option[int]{value: 43, isPresent: true}, v)
+	})
+	t.Run("maps first ok func, second failed func", func(t *testing.T) {
+		v := Some(21).Maps(mul2, returnFalse)
+		is.False(v.IsPresent())
+	})
+
+	t.Run("maps 2 failed func", func(t *testing.T) {
+		v := Some(21).Maps(returnFalse, func(i int) (int, bool) {
+			is.Fail("should not be called")
+			return 42, true
+		})
+		is.False(v.IsPresent())
+	})
+	t.Run("maps none", func(t *testing.T) {
+		v := None[int]().Maps(mul2, func(i int) (int, bool) {
+			is.Fail("should not be called")
+			return 42, true
+		})
+		is.False(v.IsPresent())
+	})
+}
+
 func TestOptionMapNone(t *testing.T) {
 	is := assert.New(t)
 

result.go

@@ -146,6 +146,21 @@ func (r Result[T]) Map(mapper func(value T) (T, error)) Result[T] {
 
 	return Err[T](r.err)
 }
+func (r Result[T]) Maps(mapperList ...func(value T) (T, error)) Result[T] {
+	if r.isErr {
+		return Err[T](r.err)
+	}
+
+	tmpValue := r.value
+	for _, mapper := range mapperList {
+		var err error
+		tmpValue, err = mapper(tmpValue)
+		if err != nil {
+			return Err[T](err)
+		}
+	}
+	return Ok[T](tmpValue)
+}
 
 // MapErr executes the mapper function if Result is invalid. It returns a new Result.
 // Play: https://go.dev/play/p/WraZixg9GGf

result_example_test.go

@@ -299,6 +299,36 @@ func ExampleResult_Map_err() {
 	// Output: true 0 error
 }
 
+func ExampleResult_Maps_ok() {
+	ok := Ok(42)
+	result := ok.Maps(
+		func(i int) (int, error) {
+			return i * 2, nil
+		},
+		func(i int) (int, error) {
+			return i + 1, nil
+		},
+	)
+
+	fmt.Println(result.IsError(), result.OrEmpty(), result.Error())
+	// Output: false 85 <nil>
+}
+
+func ExampleResult_Maps_err() {
+	ko := Err[int](err)
+	result := ko.Maps(
+		func(i int) (int, error) {
+			return i * 2, nil
+		},
+		func(i int) (int, error) {
+			return i + 1, nil
+		},
+	)
+
+	fmt.Println(result.IsError(), result.OrEmpty(), result.Error())
+	// Output: true 0 error
+}
+
 func ExampleResult_MapErr_ok() {
 	ok := Ok(42)
 	result := ok.MapErr(

result_test.go

@@ -174,6 +174,42 @@ func TestResultMap(t *testing.T) {
 	is.Equal(Result[int]{value: 0, isErr: true, err: assert.AnError}, opt2)
 }
 
+func TestResultMaps(t *testing.T) {
+	is := assert.New(t)
+	mul2 := func(i int) (int, error) {
+		return i * 2, nil
+	}
+	inc1 := func(i int) (int, error) {
+		return i + 1, nil
+	}
+	returnErr := func(i int) (int, error) {
+		return 0, assert.AnError
+	}
+	t.Run("maps 2 func ok ", func(t *testing.T) {
+		v := Ok(21).Maps(mul2, inc1)
+		is.Equal(Result[int]{value: 43, isErr: false, err: nil}, v)
+	})
+	t.Run("maps first ok func, second failed func", func(t *testing.T) {
+		v := Ok(21).Maps(mul2, returnErr)
+		is.Equal(Result[int]{value: 0, isErr: true, err: assert.AnError}, v)
+	})
+
+	t.Run("maps 2 failed func", func(t *testing.T) {
+		v := Ok(21).Maps(returnErr, func(i int) (int, error) {
+			is.Fail("should not be called")
+			return 42, nil
+		})
+		is.Equal(Result[int]{value: 0, isErr: true, err: assert.AnError}, v)
+	})
+	t.Run("errors maps ", func(t *testing.T) {
+		v := Err[int](assert.AnError).Maps(mul2, func(i int) (int, error) {
+			is.Fail("should not be called")
+			return 42, nil
+		})
+		is.Equal(Result[int]{value: 0, isErr: true, err: assert.AnError}, v)
+	})
+}
+
 func TestResultMapErr(t *testing.T) {
 	is := assert.New(t)