Class: Monads::Maybe

Inherits:

Object

• Object
• Monads::Maybe

Includes:

Monad

Defined in:

lib/ruby-monads/maybe.rb

Direct Known Subclasses

Just, Nothing

Class Method Summary

• .wrap(value) ⇒ Object

  wrap

  a -> M a.

Instance Method Summary

• #bind(&block) ⇒ Object

  bind

  (a -> M b) -> M a -> M b.

• #unwrap(default_value) ⇒ Object

  unwrap

  a -> M a -> a.

Methods included from Monad

#fmap, included, #initialize, #join, #method_missing

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Monads::Monad

Class Method Details

.wrap(value) ⇒ Object

wrap

a -> M a

# File 'lib/ruby-monads/maybe.rb', line 6

def self.wrap(value)
  (value.nil? || value.is_a?(Nothing)) ? Nothing.new : Just.new(value)
end

Instance Method Details

#bind(&block) ⇒ Object

bind

(a -> M b) -> M a -> M b

# File 'lib/ruby-monads/maybe.rb', line 11

def bind(&block)
  ensure_monadic_result(&block).call
end

#unwrap(default_value) ⇒ Object

unwrap

a -> M a -> a

# File 'lib/ruby-monads/maybe.rb', line 16

def unwrap(default_value)
  @value || default_value
end