Class: NilClass

Inherits:
Object show all
Includes:
Comparable
Defined in:
lib/carat/nil-comparable.rb,
lib/carat/nil-missing.rb,
lib/carat-dev/conditional/conditionals.rb

Overview

NilComparable

NilComparable does two things. First it make nil comparable, such that all things (except itself) are greater than it.

Secondly it provides a module called NilComparable to include into any other class to allow it to compare itself to NilClass as the greater of the two.

Author(s)

  • Paul Brannan

  • Thomas Sawyer

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args) ⇒ Object

Have nil respond to all non-existent methods, always returning nil.

require 'facet/nil/nil_missing'

nil.foo   #=> nil



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# File 'lib/carat/nil-missing.rb', line 9

def method_missing(meth, *args)
  nil
end

Instance Method Details

#<=>(x) ⇒ Object Also known as: cmp 



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# File 'lib/carat/nil-comparable.rb', line 21

def <=>(x)
  x.nil? ? 0 : -1
end

#false? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/carat-dev/conditional/conditionals.rb', line 13

def false? ; yield ; end

#true? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/carat-dev/conditional/conditionals.rb', line 14

def true? ; nil ; end