Class: AjLisp::PrimitiveAtomPredicate

Inherits:
Primitive
  • Object
show all
Defined in:
lib/ajlisp/primitive_predicates.rb

Constant Summary collapse

@@instance = 
nil

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Primitive

#evaluate

Class Method Details

.instance ⇒ Object 



24
25
26
27
 
# File 'lib/ajlisp/primitive_predicates.rb', line 24

def self.instance
    @@instance = new unless @@instance
    return @@instance
end

Instance Method Details

#apply(context, args) ⇒ Object 



29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/ajlisp/primitive_predicates.rb', line 29

def apply(context, args)
       if args[0] == nil
           return false
       end
       
       if args[0].is_a? List
           return false
       end
       
       return true
end