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Informations about the package php-maybe-monad

PHP Maybe Monad

Build Status Latest Stable Version Total Downloads Latest Unstable Version License

To deal with computations that may fail. A port of Haskell's Data.Maybe module for PHP > 5.4.

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Example

Documentation

A Maybe type encapsulates an optional value. A value of type Maybe a either contains a value of type a (represented as Just a), or it is empty (represented as Nothing). Using Maybe is a good way to deal with errors or exceptional cases without resorting to drastic measures such as Exception. The Maybe type is also a monad. It is a simple kind of error monad, where all errors are represented by Nothing. A richer error monad can be built using the Either type.

bind :: (Maybe a, callable) -> Maybe b

Equivalent to Haskell's >>= operator. Its first argument is a value in a monadic type, its second argument is a function that maps from the underlying type of the first argument to another monadic type, and its results is in that other monadic type.

fromJust :: Maybe a -> a

Extracts the element out of a Just and returns an error if its argument is Nothing.

fromMaybe :: (Maybe a, a) -> a

Takes a Maybe value and a default value. If the Maybe is Nothing, it returns the default values; otherwise, it returns the value contained in the Maybe.

isJust :: Maybe a -> boolean

Returns true if its argument is of the form Just _.

isNothing :: Maybe a -> boolean

Returns true if its argument is of the form Nothing.

maybe :: (Maybe a, b, callable) -> b

Takes a default value, a function and, of course, a Maybe value. If the Maybe value is Nothing, the function returns the default value. Otherwise, it applies the function to the value inside the Just and returns the result.

toList :: Maybe a -> array

Returns an empty list when given Nothing or a singleton list when not given Nothing.

Made with :heart: by Marcelo Camargo and Reinaldo Rauch

License

MIT

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