Script started on Fri Oct 31 11:29:47 2014
bash-3.2$ irb
irb(main):001:0> load "silly.rb"
Hello, World!
=> true
irb(main):003:0> athing = A.new
=> #<A:0x000001009ee660>
irb(main):004:0> athing.m1
=> 34
irb(main):005:0> athing.m2(1,2)
=> 15
irb(main):006:0> athing.m2(2,1)
=> false
irb(main):007:0> 15.class
=> Fixnum
irb(main):008:0> false.class
=> FalseClass
irb(main):009:0> true.class
=> TrueClass
irb(main):010:0> true.class.class
=> Class
irb(main):011:0> true.methods
=> [:to_s, :inspect, :&, :|, :^, :m, :nil?, :===, :=~, :!~, :eql?, :hash, :<=>, :class, :singleton_class, :clone, :dup, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :freeze, :frozen?, :methods, :singleton_methods, :protected_methods, :private_methods, :public_methods, :instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?, :remove_instance_variable, :instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send, :respond_to?, :extend, :display, :method, :public_method, :singleton_method, :define_singleton_method, :object_id, :to_enum, :enum_for, :==, :equal?, :!, :!=, :instance_eval, :instance_exec, :__send__, :__id__]
irb(main):012:0> 42
=> 42
irb(main):013:0> 42.class
=> Fixnum
irb(main):014:0> 42.abs
=> 42
irb(main):015:0> -42.abs
=> 42
irb(main):016:0> cthing = C.new
=> #<C:0x0000010099bb18>
irb(main):018:0> cthing.m1
hi => #<C:0x0000010099bb18>
irb(main):019:0> cthing.m2
bye => #<C:0x0000010099bb18>
irb(main):020:0> cthing.m1.m2.m3
hi bye 
=> #<C:0x0000010099bb18>
irb(main):021:0> dthing = D.new
=> #<D:0x0000010097be80>
irb(main):022:0> dthing.foo
=> nil
irb(main):023:0> dthing.m1
=> 0
irb(main):024:0> dthing.m1foo
=> 0
irb(main):025:0> D.methods
=> [:allocate, :new, :superclass, :freeze, :===, :==, :<=>, :<, :<=, :>, :>=, :to_s, :inspect, :included_modules, :include?, :name, :ancestors, :instance_methods, :public_instance_methods, :protected_instance_methods, :private_instance_methods, :constants, :const_get, :const_set, :const_defined?, :const_missing, :class_variables, :remove_class_variable, :class_variable_get, :class_variable_set, :class_variable_defined?, :public_constant, :private_constant, :singleton_class?, :include, :prepend, :module_exec, :class_exec, :module_eval, :class_eval, :method_defined?, :public_method_defined?, :private_method_defined?, :protected_method_defined?, :public_class_method, :private_class_method, :autoload, :autoload?, :instance_method, :public_instance_method, :m, :nil?, :=~, :!~, :eql?, :hash, :class, :singleton_class, :clone, :dup, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :frozen?, :methods, :singleton_methods, :protected_methods, :private_methods, :public_methods, :instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?, :remove_instance_variable, :instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send, :respond_to?, :extend, :display, :method, :public_method, :singleton_method, :define_singleton_method, :object_id, :to_enum, :enum_for, :equal?, :!, :!=, :instance_eval, :instance_exec, :__send__, :__id__]
irb(main):026:0> dthing.bar
NoMethodError: undefined method `bar' for #<D:0x0000010097be80 @foo=0>
	from (irb):26
	from /usr/local/bin/irb:11:in `<main>'
irb(main):027:0> class D
irb(main):028:1>   def bar
irb(main):029:2>     17
irb(main):030:2>   end
irb(main):031:1> end
=> :bar
irb(main):032:0> dthing.bar
=> 17
irb(main):033:0> 17.class
=> Fixnum
irb(main):034:0> 1+2
=> 3
irb(main):035:0> 1.+(2)
=> 3
irb(main):036:0> dthing.bar
=> 17
irb(main):037:0> class D
irb(main):038:1>   def bar
irb(main):039:2>     42
irb(main):040:2>   end
irb(main):041:1> end
=> :bar
irb(main):042:0> dthing.bar
=> 42
irb(main):043:0> 42.class
=> Fixnum
irb(main):044:0> class Fixnum
irb(main):045:1>   def +(x)
irb(main):046:2>    17
irb(main):047:2>   end
irb(main):048:1> end
=> :+
irb(main):049:0> 1+1
=> 17
irb(main):017:0> nil
=> nil
irb(main):017:0> nil.class
=> NilClass
irb(main):017:0> nil = 42
SyntaxError: (irb):17: Can't assign to nil
nil = 42
     ^
	from /usr/local/bin/irb:11:in `<main>'
irb(main):017:0> 17=42
SyntaxError: (irb):17: syntax error, unexpected '=', expecting end-of-input
17=42
   ^
	from /usr/local/bin/irb:11:in `<main>'
irb(main):017:0> exit

bash-3.2$ irb
irb(main):001:0> load "Rat.rb"
=> true
irb(main):002:0> half = Rat.new(3,6)
=> #<Rat:0x0000010093b470 @num=1, @den=2>
irb(main):003:0> half
=> #<Rat:0x0000010093b470 @num=1, @den=2>
irb(main):004:0> puts half
1/2
=> nil
irb(main):005:0> two = Rat.new(2)
=> #<Rat:0x00000100923078 @num=2, @den=1>
irb(main):006:0> puts two
2
=> nil
irb(main):007:0> half+2
NoMethodError: undefined method `num' for 2:Fixnum
	from Rat.rb:43:in `add!'
	from Rat.rb:57:in `+'
	from (irb):7
	from /usr/local/bin/irb:11:in `<main>'
irb(main):008:0> half+two
=> #<Rat:0x000001008411f0 @num=5, @den=2>
irb(main):009:0> puts half+two
5/2
=> nil
irb(main):010:0> exit
bash-3.2$
exit

Script done on Fri Oct 31 12:20:44 2014