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/moPublic

feat(option,result): add a map functionList method#35

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16 changes: 16 additions & 0 deletionsoption.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -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] {
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28 changes: 28 additions & 0 deletionsoption_example_test.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -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) {
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37 changes: 37 additions & 0 deletionsoption_test.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -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)

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15 changes: 15 additions & 0 deletionsresult.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -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
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30 changes: 30 additions & 0 deletionsresult_example_test.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -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(
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36 changes: 36 additions & 0 deletionsresult_test.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -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)

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