Contents

module Monad
  module Maybe
    #
    # Wraps a non-nil object allows us to treat these
    # objects as a Maybe while distinguishing them from
    # a Nothing
    #
    class Just < Base
      def initialize(value)
        @value = value
      end
  
      def method_missing(method, *args)
        Just.new(value.send(method, *args))
      end
  
      def unwrap(val)
        value
      end
  
      def nothing?
        false
      end
  
      def just?
        true
      end
  
      def nil?
        false
      end
  
      def ==(other)
        self === other || self.value == other
      end
  
      def ===(other)
        other.just? && self.value == other.value
      end
  
      def equal?(other)
        other.__id__ == self.__id__
      end
  
      def inspect
        "just(#{value.inspect})"
      end

      def to_s
        Just.new(value.to_s)
      end
  
      def to_a
        [self]
      end
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
monad-maybe-0.8.1	lib/monad/maybe/just.rb
monad-maybe-0.8.0	lib/monad/maybe/just.rb