Module: Dry::Monads::Maybe::Mixin::Constructors

Included in:

Dry::Monads, Dry::Monads::Maybe::Mixin

Defined in:

lib/dry/monads/maybe.rb

Instance Method Summary

• #Maybe(value) ⇒ Maybe::Some, Maybe::None
• #None ⇒ Maybe::None
• #Some(value = Undefined, &block) ⇒ Object

  Some constructor.

Instance Method Details

#Maybe(value) ⇒ Maybe::Some, Maybe::None

Parameters:

• value (Object) —

  the value to be stored in the monad

Returns:

• (Maybe::Some, Maybe::None)

# File 'lib/dry/monads/maybe.rb', line 198

def Maybe(value)
  Maybe.coerce(value)
end

#None ⇒ Maybe::None

Returns:

• (Maybe::None)

# File 'lib/dry/monads/maybe.rb', line 218

def None
  None.new(RightBiased::Left.trace_caller)
end

#Some(value) ⇒ Maybe::Some #Some(&block) ⇒ Maybe::Some

Some constructor

Overloads:

• #Some(value) ⇒ Maybe::Some

  Parameters:

  • value (Object) —

    any value except nil

  Returns:

  • (Maybe::Some)
• #Some(&block) ⇒ Maybe::Some

  Parameters:

  • block (Proc) —

    a block to be wrapped with Some

  Returns:

  • (Maybe::Some)

# File 'lib/dry/monads/maybe.rb', line 212

def Some(value = Undefined, &block)
  v = Undefined.default(value, block || Unit)
  Some.new(v)
end