metaprogramming started

define_method.rb

@@ -0,0 +1,10 @@
+# define_method.rb
+
+class Square
+  define_method :area do |side|
+    side * side
+  end
+end
+
+s = Square.new
+puts s.area 5

function_many_arguments.rb

@@ -5,4 +5,5 @@ def print_line char = '_' length = 20
 end
 
 print_line
-print_line 40
+print_line '*'
+print_line '&', 40

inheritance.rb

@@ -28,7 +28,7 @@ def side_length
 	end
 
 	def side_length=(length)
-		@width = @height = length
+		@width = @length = length
 	end
 end
 

method_missing.rb

@@ -0,0 +1,15 @@
+# method_missing.rb
+
+class Something
+	def method_missing method, *args, &block
+		puts "You called: #{method}"
+		p args
+		block.call 7
+	end
+end
+
+s = Something.new
+s.call_method "boo", 5 do |x|
+	x.times{ puts "in block" }
+end
+

method_missing_in_action.rb

@@ -0,0 +1,18 @@
+# method_missing_in_action.rb
+
+class Person
+  attr_accessor :name, :age
+
+  def initialize name, age
+    @name, @age = name, age
+  end
+
+  def method_missing method_name
+    method_name.to_s.match(/get_(\w+)/)
+    eval("self.#{$1}")
+  end
+end
+
+person = Person.new "Zigor", "67893"
+puts "#{person.get_name} is #{person.get_age} years old"
+

send.rb

@@ -0,0 +1,12 @@
+class Person
+	attr_accessor :name
+
+	def speak
+		"Hello I am #{@name}"
+	end
+end
+
+
+p = Person.new
+p.name = "Karthik"
+puts p.send(:speak)