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fn: breaking - polish Either API

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This commit is contained in:
Keagan McClelland
2024-08-14 18:02:51 -07:00
parent c6734ea013
commit 1805fd6f19
3 changed files with 13 additions and 13 deletions
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10
fn/either.go
View File

@@ -20,7 +20,7 @@ func NewRight[L any, R any](r R) Either[L, R] {
// ElimEither is the universal Either eliminator. It can be used to safely // ElimEither is the universal Either eliminator. It can be used to safely
// handle all possible values inside the Either by supplying two continuations, // handle all possible values inside the Either by supplying two continuations,
// one for each side of the Either. // one for each side of the Either.
func ElimEither[L, R, O any](f func(L) O, g func(R) O, e Either[L, R]) O { func ElimEither[L, R, O any](e Either[L, R], f func(L) O, g func(R) O) O {
if !e.isRight { if !e.isRight {
return f(e.left) return f(e.left)
} }
@@ -52,9 +52,9 @@ func (e Either[L, R]) IsRight() bool {
return e.isRight return e.isRight
} }
// LeftToOption converts a Left value to an Option, returning None if the inner // LeftToSome converts a Left value to an Option, returning None if the inner
// Either value is a Right value. // Either value is a Right value.
func (e Either[L, R]) LeftToOption() Option[L] { func (e Either[L, R]) LeftToSome() Option[L] {
if e.isRight { if e.isRight {
return None[L]() return None[L]()
} }
@@ -62,9 +62,9 @@ func (e Either[L, R]) LeftToOption() Option[L] {
return Some(e.left) return Some(e.left)
} }
// RightToOption converts a Right value to an Option, returning None if the // RightToSome converts a Right value to an Option, returning None if the
// inner Either value is a Left value. // inner Either value is a Left value.
func (e Either[L, R]) RightToOption() Option[R] { func (e Either[L, R]) RightToSome() Option[R] {
if !e.isRight { if !e.isRight {
return None[R]() return None[R]()
} }

12
fn/either_test.go
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@@ -10,17 +10,17 @@ func TestPropConstructorEliminatorDuality(t *testing.T) {
Len := func(s string) int { return len(s) } // smh Len := func(s string) int { return len(s) } // smh
if isRight { if isRight {
v := ElimEither( v := ElimEither(
NewRight[int, string](s),
Iden[int], Iden[int],
Len, Len,
NewRight[int, string](s),
) )
return v == Len(s) return v == Len(s)
} }
v := ElimEither( v := ElimEither(
NewLeft[int, string](i),
Iden[int], Iden[int],
Len, Len,
NewLeft[int, string](i),
) )
return v == i return v == i
} }
@@ -99,16 +99,16 @@ func TestPropToOptionIdentities(t *testing.T) {
if isRight { if isRight {
e = NewRight[int, string](s) e = NewRight[int, string](s)
r2O := e.RightToOption() == Some(s) r2O := e.RightToSome() == Some(s)
o2R := e == OptionToRight(Some(s), i) o2R := e == OptionToRight(Some(s), i)
l2O := e.LeftToOption() == None[int]() l2O := e.LeftToSome() == None[int]()
return r2O && o2R && l2O return r2O && o2R && l2O
} else { } else {
e = NewLeft[int, string](i) e = NewLeft[int, string](i)
l2O := e.LeftToOption() == Some(i) l2O := e.LeftToSome() == Some(i)
o2L := e == OptionToLeft(Some(i), s) o2L := e == OptionToLeft(Some(i), s)
r2O := e.RightToOption() == None[string]() r2O := e.RightToSome() == None[string]()
return l2O && o2L && r2O return l2O && o2L && r2O
} }

4
fn/result.go
View File

@@ -99,12 +99,12 @@ func MapOk[A, B any](f func(A) B) func(Result[A]) Result[B] {
// //
// Deprecated: Use OkToSome instead. // Deprecated: Use OkToSome instead.
func (r Result[T]) Option() Option[T] { func (r Result[T]) Option() Option[T] {
return r.Either.LeftToOption() return r.Either.LeftToSome()
} }
// OkToSome mutes the error value of the result. // OkToSome mutes the error value of the result.
func (r Result[T]) OkToSome() Option[T] { func (r Result[T]) OkToSome() Option[T] {
return r.Either.LeftToOption() return r.Either.LeftToSome()
} }
// WhenResult executes the given function if the Result is a success. // WhenResult executes the given function if the Result is a success.