renamed some knowledge permutations, added koans 2 and 3

metakoans-ryan/knowledge_for_koan_01_assert_5.rb → metakoans-ryan/knowledge_for_koan_01_5.rb

@@ -4,7 +4,7 @@ class SomeClass
   def self.attribute; end  
 
   def a?
-    return @a
+    !@a.nil?
   end
 
   def a

metakoans-ryan/knowledge_for_koan_02_0.rb

@@ -0,0 +1,19 @@
+module MetaKoans
+
+class SomeClass
+  def self.attribute(name='a'); end  
+
+  def a?
+    !@a.nil?
+  end
+
+  def a
+    @a
+  end
+
+  def a=(value)
+    @a = value
+  end
+end
+
+end

metakoans-ryan/knowledge_for_koan_02_1.rb

@@ -0,0 +1,12 @@
+module MetaKoans
+
+class SomeClass
+  def self.attribute(name='a')
+    attr_accessor name
+    define_method name + "?" do
+      !send(name).nil?
+    end
+  end  
+end
+
+end

metakoans-ryan/knowledge_for_koan_03_0.rb

@@ -0,0 +1,21 @@
+module MetaKoans
+
+class SomeClass
+  class << self
+    def self.attribute(name='a')
+      attr_accessor name
+      define_method name + "?" do
+        !send(name).nil?
+      end
+    end      
+  end
+
+  def self.attribute(name='a')
+    attr_accessor name
+    define_method name + "?" do
+      !send(name).nil?
+    end
+  end  
+end
+
+end

metakoans-ryan/knowledge_for_koan_03_1.rb

@@ -0,0 +1,19 @@
+module MetaKoans
+
+module Attributable
+  def attribute(name='a')
+    attr_accessor name
+    define_method name + "?" do
+      !send(name).nil?
+    end
+  end        
+end
+
+class SomeClass
+  class << self
+    extend Attributable
+  end
+  extend Attributable
+end
+
+end

metakoans-ryan/metakoans.rb

@@ -100,7 +100,7 @@ def self::method_missing m, *a, &b
 
 
 # knowledge = ARGV.shift or abort "#{ $0 } knowledge.rb"
-student = MetaStudent.new 'knowledge_for_koan_02_assert_0'
+student = MetaStudent.new 'knowledge_for_koan_03_1'
 
 
 module MetaKoans
@@ -131,6 +131,21 @@ def koan_02
     assert{ o.b? }    
   end
 
+  def koan_03
+    SomeClass.instance_eval do
+      class << self
+        attribute 'b'
+      end
+    end
+
+    assert{ not SomeClass.b? }
+    assert{ SomeClass.b = 42 }
+    assert{ SomeClass.b == 42 }
+    assert{ SomeClass.b? }    
+  end
+
+
+
 #
 # 'attribute' must provide getter, setter, and query to instances
 #