Script started on Wed May  5 10:17:19 2021
bash-3.2$ load "silly.rb"
irb(main):001:0> load "silly.rb"
Hello, World!
=> true
irb(main):002:0> athing = A.new
=> #<A:0x00007f9301896ca0>
irb(main):003:0> athing
=> #<A:0x00007f9301896ca0>
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> bthing = B.new
=> #<B:0x00007f92ff886370>
irb(main):008:0> bthing.m
=> 43
irb(main):009:0> m
=> 43
irb(main):010:0> bthing.m1
=> 4
irb(main):011:0> bthing.m3 17
=> 38
irb(main):013:0> cthing  = C.new
=> #<C:0x00007f93018b56c8>
irb(main):014:0> cthing.m1
hi => #<C:0x00007f93018b56c8>
irb(main):015:0> cthing.m1.m2.m3
hi bye 
=> #<C:0x00007f93018b56c8>
irb(main):016:0> puts cthing.m1.m2.m3
hi bye 
#<C:0x00007f93018b56c8>
=> nil
irb(main):017:0> s = cthing.m1.m2.m3
hi bye 
=> #<C:0x00007f93018b56c8>
irb(main):018:0> s
=> #<C:0x00007f93018b56c8>
irb(main):019:0> puts s
#<C:0x00007f93018b56c8>
=> nil
irb(main):020:0> n=17
=> 17
irb(main):021:0> n
=> 17
irb(main):022:0> n+1
=> 18
irb(main):023:0> n.+(1)
=> 18
irb(main):024:0> n.+ 1
=> 18
irb(main):025:0> 1+1
=> 2
irb(main):026:0> 17+1
=> 18
irb(main):027:0> 17.+(1)
=> 18
irb(main):028:0> 17
=> 17
irb(main):029:0> 17.class
=> Fixnum
irb(main):030:0> -17.abs
=> 17
irb(main):034:0> -17.class
=> Fixnum
irb(main):035:0> -17.methods
=> [:%, :&, :*, :+, :-, :/, :<, :>, :^, :|, :~, :-@, :**, :<=>, :<<, :>>, :<=, :>=, :==, :===, :[], :inspect, :size, :succ, :to_s, :to_f, :div, :divmod, :fdiv, :modulo, :abs, :magnitude, :zero?, :odd?, :even?, :bit_length, :double, :to_int, :to_i, :next, :upto, :chr, :ord, :integer?, :floor, :ceil, :round, :truncate, :downto, :times, :pred, :to_r, :numerator, :denominator, :rationalize, :gcd, :lcm, :gcdlcm, :+@, :eql?, :singleton_method_added, :coerce, :i, :remainder, :real?, :nonzero?, :step, :positive?, :negative?, :quo, :arg, :rectangular, :rect, :polar, :real, :imaginary, :imag, :abs2, :angle, :phase, :conjugate, :conj, :to_c, :between?, :m, :tap, :public_send, :instance_variables, :instance_variable_set, :instance_variable_defined?, :remove_instance_variable, :private_methods, :kind_of?, :is_a?, :instance_variable_get, :method, :public_method, :singleton_method, :instance_of?, :extend, :define_singleton_method, :to_enum, :enum_for, :=~, :!~, :respond_to?, :freeze, :object_id, :display, :send, :nil?, :hash, :class, :singleton_class, :clone, :dup, :itself, :taint, :tainted?, :untaint, :untrust, :trust, :untrusted?, :methods, :protected_methods, :frozen?, :public_methods, :singleton_methods, :!, :!=, :__send__, :equal?, :instance_eval, :instance_exec, :__id__]
irb(main):036:0> nil
=> nil
irb(main):037:0> nil.class
=> NilClass
irb(main):038:0> nil.methods
=> [:&, :^, :|, :===, :inspect, :to_a, :to_s, :to_i, :to_f, :nil?, :to_h, :to_r, :rationalize, :to_c, :m, :tap, :public_send, :instance_variables, :instance_variable_set, :instance_variable_defined?, :remove_instance_variable, :private_methods, :kind_of?, :is_a?, :instance_variable_get, :method, :public_method, :singleton_method, :instance_of?, :extend, :define_singleton_method, :to_enum, :enum_for, :<=>, :=~, :!~, :eql?, :respond_to?, :freeze, :object_id, :display, :send, :hash, :class, :singleton_class, :clone, :dup, :itself, :taint, :tainted?, :untaint, :untrust, :trust, :untrusted?, :methods, :protected_methods, :frozen?, :public_methods, :singleton_methods, :!, :==, :!=, :__send__, :equal?, :instance_eval, :instance_exec, :__id__]
irb(main):039:0> nil.methods.length
=> 67
irb(main):040:0> dthing = D.new
=> #<D:0x00007f92ff0882e0>
irb(main):041:0> dthing.foo
=> nil
irb(main):042:0> dthing.m1
=> 0
irb(main):043:0> dthing.foo
=> 0
irb(main):044:0> dthing.m2 3
=> 3
irb(main):046:0> ething = E.new(5)
=> #<E:0x00007f9301817950 @foo=5>
irb(main):047:0> ething.foo
=> 5
irb(main):048:0> class D
irb(main):049:1>   def bar
irb(main):050:2>     17
irb(main):051:2>   end
irb(main):052:1> end
=> :bar
irb(main):053:0> dthing.bar
=> 17
irb(main):054:0> dthing.bam
NoMethodError: undefined method `bam' for #<D:0x00007f92ff0882e0 @foo=3>
Did you mean?  bar
	from (irb):54
	from /usr/bin/irb:11:in `<main>'
irb(main):055:0> 1.foo
NoMethodError: undefined method `foo' for 1:Fixnum
Did you mean?  floor
	from (irb):55
	from /usr/bin/irb:11:in `<main>'
irb(main):056:0> class Fixnum
irb(main):057:1>   def foo
irb(main):058:2>     "bar"
irb(main):059:2>   end
irb(main):060:1> end
=> :foo
irb(main):061:0> 1.foo
=> "bar"
irb(main):062:0> 1.+(2)
=> 3
irb(main):063:0> class Fixnum
irb(main):064:1>   def +(x)
irb(main):065:2>     17
irb(main):066:2>   end
irb(main):067:1> end
=> :+
irb(main):068:0> 1+2
=> 17
irb(main):017:0> 42+17
=> 17
irb(main):017:0> nil
=> nil
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:0x00007f94a4906ee8 @num=0, @den=1>
irb(main):003:0> half
=> #<Rat:0x00007f94a4906ee8 @num=0, @den=1>
irb(main):004:0> puts half
0
=> nil
irb(main):005:0> half = Rat.new(3,6)
=> #<Rat:0x00007f94a40dfd28 @num=1, @den=2>
irb(main):006:0> half
=> #<Rat:0x00007f94a40dfd28 @num=1, @den=2>
irb(main):007:0> puts half
1/2
=> nil
irb(main):008:0> ^D
bash-3.2$ exit

Script done on Wed May  5 11:23:31 2021