{"id":469531,"date":"2025-08-04T15:01:30","date_gmt":"2025-08-04T15:01:30","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=469531"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=469531","title":{"rendered":"\u0412\u0430\u043b\u0438\u0434\u0430\u0442\u043e\u0440 \u043d\u0430 Haskell \u0438 \u043f\u0440\u0438\u0447\u0435\u043c \u0437\u0434\u0435\u0441\u044c Applicative<\/span>"},"content":{"rendered":"
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\u041d\u0430 \u043f\u0443\u0442\u0438 \u0438\u0437\u0443\u0447\u0435\u043d\u0438\u044f Haskell \u0441\u0442\u043e\u0438\u0442 \u043c\u043d\u043e\u0433\u043e \u0430\u0431\u0441\u0442\u0440\u0430\u043a\u0446\u0438\u0439, \u0431\u0435\u0437 \u043f\u043e\u043d\u0438\u043c\u0430\u043d\u0438\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0435\u0442 \u0441\u043c\u044b\u0441\u043b\u0430 \u0434\u0432\u0438\u0433\u0430\u0442\u044c\u0441\u044f \u0434\u0430\u043b\u044c\u0448\u0435. \u041e\u0434\u0438\u043d \u0438\u0437 \u0442\u0430\u043a\u0438\u0445 \u0440\u0443\u0431\u0435\u0436\u0435\u0439\u00a0\u2014 \u0430\u043f\u043f\u043b\u0438\u043a\u0430\u0442\u0438\u0432\u043d\u044b\u0439 \u0444\u0443\u043d\u043a\u0442\u043e\u0440.<\/p>\n

\u0420\u0430\u0437\u0431\u0435\u0440\u0435\u043c \u043f\u0440\u0438\u043c\u0435\u0440: \u043d\u0430\u043f\u0438\u0448\u0435\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u0432\u0430\u043b\u0438\u0434\u0430\u0442\u043e\u0440 \u0438 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043a\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f Applicative.<\/p>\n

\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f:<\/p>\n

type Name = String type Email = String  data User = User Name Email     deriving (Show)<\/code><\/pre>\n
\u041f\u043e\u043f\u0440\u043e\u0431\u0443\u0435\u043c \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0439 Either<\/h2>\n
\u0424\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u0430\u043b\u0438\u0434\u0430\u0446\u0438\u0438:<\/p>\n
validateName :: Name -> Either [String] Name validateName \"\" = Left [\"name cannot be empty\"] validateName s = pure s  validateEmail :: Email -> Either [String] Email validateEmail \"\" = Left [\"email cannot be empty\"] validateEmail s = pure s<\/code><\/pre>\n
\u0422\u0438\u043f Either \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0438 \u0444\u0443\u043d\u043a\u0442\u043e\u0440\u043e\u043c, \u0438 \u0430\u043f\u043f\u043b\u0438\u043a\u0430\u0442\u0438\u0432\u043d\u044b\u043c \u0444\u0443\u043d\u043a\u0442\u043e\u0440\u043e\u043c, \u0432\u043e\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u0441\u044f \u044d\u0442\u0438\u043c, \u0447\u0442\u043e\u0431\u044b \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u044e \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0438\u043b\u0438 \u0441\u043e\u0437\u0434\u0430\u0435\u0442 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0438\u043b\u0438 \u043d\u0435\u0442.<\/p>\n
validateUser :: Name -> Email -> Either [String] User validateUser n e =     User <$> validateName n         <*> validateEmail e  -- >>> validateUser \"John\" \"john@email.com\" -- Right (User \"John\" \"john@email.com\")  -- >>> validateUser \"\" \"\" -- Left [\"name cannot be empty\"]<\/code><\/pre>\n
\u0420\u0430\u0431\u043e\u0442\u0430\u0435\u0442, \u043d\u043e \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b, \u0447\u0442\u043e\u0431\u044b \u0432\u0430\u043b\u0438\u0434\u0430\u0442\u043e\u0440 \u0441\u043e\u0431\u0438\u0440\u0430\u043b \u0432\u0441\u0435 \u043e\u0448\u0438\u0431\u043a\u0438. \u0412\u043e\u0442 \u043a\u0430\u043a \u0434\u043e\u043b\u0436\u0435\u043d \u0432\u044b\u0433\u043b\u044f\u0434\u0435\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043f\u0440\u0438\u043c\u0435\u0440\u0430:<\/p>\n
— Left [«name cannot be empty»,»email cannot be empty»]<\/p>\n
\u041d\u043e\u0432\u044b\u0439 \u0442\u0438\u043f Validator<\/h2>\n
Either \u043d\u0435 \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442 \u0434\u043b\u044f \u043d\u0430\u0448\u0435\u0439 \u0437\u0430\u0434\u0430\u0447\u0438. \u041d\u043e \u043e\u043d \u043d\u0430\u043c \u043f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f:<\/p>\n
newtype Validator a = Validator     { runValidator :: Either [String] a     }<\/code><\/pre>\n
\u0414\u0430, \u0442\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438: \u0441\u043f\u0438\u0441\u043e\u043a \u0441\u0442\u0440\u043e\u043a, \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442 \u0434\u043b\u044f \u043d\u0430\u0448\u0435\u0439 \u0437\u0430\u0434\u0430\u0447\u0438. \u0410 \u043a\u0430\u043a \u0436\u0435 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c?<\/p>\n
newtype Validator e a = Validator     { runValidator :: Either e a     }<\/code><\/pre>\n
\u0421\u0435\u0439\u0447\u0430\u0441 \u043d\u0443\u0436\u043d\u043e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440\u044b \u043a\u043b\u0430\u0441\u0441\u043e\u0432 Functor \u0438 Applicative \u0434\u043b\u044f \u0432\u0430\u043b\u0438\u0434\u0430\u0442\u043e\u0440\u0430. \u041d\u0430\u0441 \u0443\u0441\u0442\u0440\u043e\u0438\u0442 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f Functor \u0434\u043b\u044f Either:<\/p>\n
instance Functor (Validator e) where     fmap f = Validator . (f <$>) . runValidator<\/code><\/pre>\n
\u041d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0431\u0443\u0434\u0435\u0442 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u0442\u044c \u043e\u0448\u0438\u0431\u043a\u0438 \u0434\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043f\u043e\u0434\u043e\u0439\u0434\u0435\u0442 (<>) \u0438\u0437 \u043a\u043b\u0430\u0441\u0441\u0430 \u0442\u0438\u043f\u043e\u0432 Semigroup. \u0423\u0447\u0442\u0435\u043c \u044d\u0442\u043e:<\/p>\n
instance Semigroup e => Applicative (Validator e) where     pure = Validator . pure     Validator (Left e1) <*> Validator (Left e2) =         Validator $ Left $ e1 <> e2     Validator eF <*> Validator eA =         Validator $ ($) <$> eF <*> eA<\/code><\/pre>\n
\u041f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f \u0432\u0441\u043f\u043e\u043c\u043e\u0433\u0430\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f:<\/p>\n
throwError :: e -> Validator e a throwError = Validator . Left<\/code><\/pre>\n
\u041f\u0435\u0440\u0435\u043f\u0438\u0448\u0435\u043c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u0430\u043b\u0438\u0434\u0430\u0446\u0438\u0438:<\/p>\n
validateName :: Name -> Validator [String] Name validateName \"\" = throwError [\"name cannot be empty\"] validateName s = pure s  validateEmail :: Email -> Validator [String] Email validateEmail \"\" = throwError [\"email cannot be empty\"] validateEmail s = pure s  validateUser :: Name -> Email -> Either [String] User validateUser n e =     runValidator $         User <$> validateName n             <*> validateEmail e  -- >>> validateUser \"John\" \"john@email.com\" -- Right (User \"John\" \"john@email.com\")  -- >>> validateUser \"\" \"\" -- Left [\"name cannot be empty\",\"email cannot be empty\"]<\/code><\/pre>\n
\u0422\u0430\u043a\u043e\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043d\u0430\u0441 \u0443\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u0442. \u0418 \u043e\u0431\u043e\u0448\u043b\u0438\u0441\u044c \u0441\u043e\u0432\u0441\u0435\u043c \u0431\u0435\u0437 \u043c\u043e\u043d\u0430\u0434.<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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 \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438  https:\/\/habr.com\/ru\/articles\/933862\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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\u041d\u0430 \u043f\u0443\u0442\u0438 \u0438\u0437\u0443\u0447\u0435\u043d\u0438\u044f Haskell \u0441\u0442\u043e\u0438\u0442 \u043c\u043d\u043e\u0433\u043e \u0430\u0431\u0441\u0442\u0440\u0430\u043a\u0446\u0438\u0439, \u0431\u0435\u0437 \u043f\u043e\u043d\u0438\u043c\u0430\u043d\u0438\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0435\u0442 \u0441\u043c\u044b\u0441\u043b\u0430 \u0434\u0432\u0438\u0433\u0430\u0442\u044c\u0441\u044f \u0434\u0430\u043b\u044c\u0448\u0435. \u041e\u0434\u0438\u043d \u0438\u0437 \u0442\u0430\u043a\u0438\u0445 \u0440\u0443\u0431\u0435\u0436\u0435\u0439\u00a0\u2014 \u0430\u043f\u043f\u043b\u0438\u043a\u0430\u0442\u0438\u0432\u043d\u044b\u0439 \u0444\u0443\u043d\u043a\u0442\u043e\u0440.<\/p>\n
\u0420\u0430\u0437\u0431\u0435\u0440\u0435\u043c \u043f\u0440\u0438\u043c\u0435\u0440: \u043d\u0430\u043f\u0438\u0448\u0435\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u0432\u0430\u043b\u0438\u0434\u0430\u0442\u043e\u0440 \u0438 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043a\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f Applicative.<\/p>\n
\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f:<\/p>\n
type Name = String type Email = String  data User = User Name Email     deriving (Show)<\/code><\/pre>\n
\u041f\u043e\u043f\u0440\u043e\u0431\u0443\u0435\u043c \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0439 Either<\/h2>\n
\u0424\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u0430\u043b\u0438\u0434\u0430\u0446\u0438\u0438:<\/p>\n
validateName :: Name -> Either [String] Name validateName \"\" = Left [\"name cannot be empty\"] validateName s = pure s  validateEmail :: Email -> Either [String] Email validateEmail \"\" = Left [\"email cannot be empty\"] validateEmail s = pure s<\/code><\/pre>\n
\u0422\u0438\u043f Either \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0438 \u0444\u0443\u043d\u043a\u0442\u043e\u0440\u043e\u043c, \u0438 \u0430\u043f\u043f\u043b\u0438\u043a\u0430\u0442\u0438\u0432\u043d\u044b\u043c \u0444\u0443\u043d\u043a\u0442\u043e\u0440\u043e\u043c, \u0432\u043e\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u0441\u044f \u044d\u0442\u0438\u043c, \u0447\u0442\u043e\u0431\u044b \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u044e \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0438\u043b\u0438 \u0441\u043e\u0437\u0434\u0430\u0435\u0442 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0438\u043b\u0438 \u043d\u0435\u0442.<\/p>\n
validateUser :: Name -> Email -> Either [String] User validateUser n e =     User <$> validateName n         <*> validateEmail e  -- >>> validateUser \"John\" \"john@email.com\" -- Right (User \"John\" \"john@email.com\")  -- >>> validateUser \"\" \"\" -- Left [\"name cannot be empty\"]<\/code><\/pre>\n
\u0420\u0430\u0431\u043e\u0442\u0430\u0435\u0442, \u043d\u043e \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b, \u0447\u0442\u043e\u0431\u044b \u0432\u0430\u043b\u0438\u0434\u0430\u0442\u043e\u0440 \u0441\u043e\u0431\u0438\u0440\u0430\u043b \u0432\u0441\u0435 \u043e\u0448\u0438\u0431\u043a\u0438. \u0412\u043e\u0442 \u043a\u0430\u043a \u0434\u043e\u043b\u0436\u0435\u043d \u0432\u044b\u0433\u043b\u044f\u0434\u0435\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043f\u0440\u0438\u043c\u0435\u0440\u0430:<\/p>\n
— Left [«name cannot be empty»,»email cannot be empty»]<\/p>\n
\u041d\u043e\u0432\u044b\u0439 \u0442\u0438\u043f Validator<\/h2>\n
Either \u043d\u0435 \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442 \u0434\u043b\u044f \u043d\u0430\u0448\u0435\u0439 \u0437\u0430\u0434\u0430\u0447\u0438. \u041d\u043e \u043e\u043d \u043d\u0430\u043c \u043f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f:<\/p>\n
newtype Validator a = Validator     { runValidator :: Either [String] a     }<\/code><\/pre>\n
\u0414\u0430, \u0442\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438: \u0441\u043f\u0438\u0441\u043e\u043a \u0441\u0442\u0440\u043e\u043a, \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442 \u0434\u043b\u044f \u043d\u0430\u0448\u0435\u0439 \u0437\u0430\u0434\u0430\u0447\u0438. \u0410 \u043a\u0430\u043a \u0436\u0435 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c?<\/p>\n
newtype Validator e a = Validator     { runValidator :: Either e a     }<\/code><\/pre>\n
\u0421\u0435\u0439\u0447\u0430\u0441 \u043d\u0443\u0436\u043d\u043e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440\u044b \u043a\u043b\u0430\u0441\u0441\u043e\u0432 Functor \u0438 Applicative \u0434\u043b\u044f \u0432\u0430\u043b\u0438\u0434\u0430\u0442\u043e\u0440\u0430. \u041d\u0430\u0441 \u0443\u0441\u0442\u0440\u043e\u0438\u0442 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f Functor \u0434\u043b\u044f Either:<\/p>\n
instance Functor (Validator e) where     fmap f = Validator . (f <$>) . runValidator<\/code><\/pre>\n
\u041d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0431\u0443\u0434\u0435\u0442 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u0442\u044c \u043e\u0448\u0438\u0431\u043a\u0438 \u0434\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043f\u043e\u0434\u043e\u0439\u0434\u0435\u0442 (<>) \u0438\u0437 \u043a\u043b\u0430\u0441\u0441\u0430 \u0442\u0438\u043f\u043e\u0432 Semigroup. \u0423\u0447\u0442\u0435\u043c \u044d\u0442\u043e:<\/p>\n
instance Semigroup e => Applicative (Validator e) where     pure = Validator . pure     Validator (Left e1) <*> Validator (Left e2) =         Validator $ Left $ e1 <> e2     Validator eF <*> Validator eA =         Validator $ ($) <$> eF <*> eA<\/code><\/pre>\n
\u041f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f \u0432\u0441\u043f\u043e\u043c\u043e\u0433\u0430\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f:<\/p>\n
throwError :: e -> Validator e a throwError = Validator . Left<\/code><\/pre>\n
\u041f\u0435\u0440\u0435\u043f\u0438\u0448\u0435\u043c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u0430\u043b\u0438\u0434\u0430\u0446\u0438\u0438:<\/p>\n
validateName :: Name -> Validator [String] Name validateName \"\" = throwError [\"name cannot be empty\"] validateName s = pure s  validateEmail :: Email -> Validator [String] Email validateEmail \"\" = throwError [\"email cannot be empty\"] validateEmail s = pure s  validateUser :: Name -> Email -> Either [String] User validateUser n e =     runValidator $         User <$> validateName n             <*> validateEmail e  -- >>> validateUser \"John\" \"john@email.com\" -- Right (User \"John\" \"john@email.com\")  -- >>> validateUser \"\" \"\" -- Left [\"name cannot be empty\",\"email cannot be empty\"]<\/code><\/pre>\n
\u0422\u0430\u043a\u043e\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043d\u0430\u0441 \u0443\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u0442. \u0418 \u043e\u0431\u043e\u0448\u043b\u0438\u0441\u044c \u0441\u043e\u0432\u0441\u0435\u043c \u0431\u0435\u0437 \u043c\u043e\u043d\u0430\u0434.<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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 \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438  https:\/\/habr.com\/ru\/articles\/933862\/<\/a>
<\/br><\/br><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-469531","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/469531","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=469531"}],"version-history":[{"count":0,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/469531\/revisions"}],"wp:attachment":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=469531"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=469531"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=469531"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}