Class: Monadic::None

Inherits:
Object
  • Object
show all
Defined in:
lib/monadic/option.rb

Overview

Represents the Option if there is no value available

Class Method Summary collapse

Class Method Details

.empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/monadic/option.rb', line 76

def empty?
  true
end

.fetch(default = nil) ⇒ Object Also known as: or, _

Raises:



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# File 'lib/monadic/option.rb', line 80

def fetch(default=nil)
  raise NoValueError if default.nil?
  default
end

.method_missing(m, *args) ⇒ Object 



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# File 'lib/monadic/option.rb', line 87

def method_missing(m, *args)
  self
end

.to_ary ⇒ Object Also known as: to_a 



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# File 'lib/monadic/option.rb', line 71

def to_ary
  []
end

.to_s ⇒ Object 



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# File 'lib/monadic/option.rb', line 91

def to_s
  'None'
end

.truly? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/monadic/option.rb', line 95

def truly?
  false
end