Script started on Fri May  7 10:18:26 2021
bash-3.2$ irb
irb(main):001:0> load "Rat.rb"
=> true
irb(main):002:0> half = Rat.new(4,8)
=> #<Rat:0x00007fc53802eb58 @num=1, @den=2>
irb(main):003:0> half
=> #<Rat:0x00007fc53802eb58 @num=1, @den=2>
irb(main):004:0> half.to_s
=> "1/2"
irb(main):005:0> puts half
1/2
=> nil
irb(main):006:0> gets
hello
=> "hello\n"
irb(main):007:0> third = Rat.new (1,3)
=> #<Rat:0x00007fc5360ff0c0 @num=1, @den=3>
irb(main):008:0> four = Rat.new(4)
=> #<Rat:0x00007fc5360ec3f8 @num=4, @den=1>
irb(main):009:0> puts third
1/3
=> nil
irb(main):010:0> puts four
4
=> nil
irb(main):011:0> four + half
=> #<Rat:0x00007fc53805f438 @num=9, @den=2>
irb(main):012:0> puts four + half
9/2
=> nil
irb(main):013:0> half+two
NameError: undefined local variable or method `two' for main:Object
	from (irb):13
	from /usr/bin/irb:11:in `<main>'
irb(main):014:0> half+four
=> #<Rat:0x00007fc5360c49e8 @num=9, @den=2>
irb(main):015:0> half+4
NoMethodError: undefined method `num' for 4:Fixnum
	from Rat.rb:43:in `add!'
	from Rat.rb:57:in `+'
	from (irb):15
	from /usr/bin/irb:11:in `<main>'
irb(main):016:0> 4+half
TypeError: Rat can't be coerced into Fixnum
	from (irb):16:in `+'
	from (irb):16
	from /usr/bin/irb:11:in `<main>'
irb(main):017:0> words = "hello" "cse" "413" ]
=> ["hellocse413"]
irb(main):018:0> nums [ 1, 2, 3, 4 ]
NoMethodError: undefined method `nums' for main:Object
	from (irb):18
	from /usr/bin/irb:11:in `<main>'
irb(main):019:0> nums =  [1,2,3,4]
=> [1, 2, 3, 4]
irb(main):020:0> words
=> ["hellocse413"]
irb(main):021:0> nums
=> [1, 2, 3, 4]
irb(main):022:0> words = [ "hello", "cse" , "413" ]
=> ["hello", "cse", "413"]
irb(main):023:0> words
=> ["hello", "cse", "413"]
irb(main):024:0> nums[3]
=> 4
irb(main):025:0> nums[1]=17
=> 17
irb(main):026:0> nums
=> [1, 17, 3, 4]
irb(main):027:0> nums[10]= "ten"
=> "ten"
irb(main):028:0> nums
=> [1, 17, 3, 4, nil, nil, nil, nil, nil, nil, "ten"]
irb(main):029:0> nums[-7]
=> nil
irb(main):030:0> nums[-9]
=> 3
irb(main):031:0> nums[-1]
=> "ten"
irb(main):032:0> nums[1,2]
=> [17, 3]
irb(main):033:0> nums[1..3]
=> [17, 3, 4]
irb(main):034:0> nums[4,10]=42
=> 42
irb(main):035:0> nums
=> [1, 17, 3, 4, 42]
irb(main):036:0> nums[1,2]=[7,8,9,10]
=> [7, 8, 9, 10]
irb(main):037:0> nums
=> [1, 7, 8, 9, 10, 4, 42]
irb(main):038:0> nums.class
=> Array
irb(main):039:0> nums.methods
=> [:keep_if, :values_at, :delete_at, :delete_if, :reject!, :transpose, :fill, :assoc, :rassoc, :to_h, :uniq, :uniq!, :compact, :include?, :flatten, :shuffle!, :shuffle, :flatten!, :compact!, :permutation, :combination, :repeated_combination, :product, :repeated_permutation, :bsearch, :bsearch_index, :sample, :rotate!, :&, :*, :+, :-, :sort, :count, :find_index, :select, :reject, :collect, :map, :first, :any?, :pack, :reverse_each, :zip, :take, :take_while, :drop, :drop_while, :cycle, :insert, :|, :index, :rindex, :replace, :clear, :<=>, :<<, :==, :[], :[]=, :empty?, :eql?, :reverse!, :reverse, :concat, :inspect, :delete, :length, :size, :each, :slice, :slice!, :to_ary, :to_a, :to_s, :dig, :hash, :at, :fetch, :frozen?, :last, :push, :pop, :shift, :unshift, :join, :rotate, :each_index, :sort!, :sort_by!, :collect!, :map!, :select!, :find, :entries, :sort_by, :grep, :grep_v, :detect, :find_all, :flat_map, :collect_concat, :inject, :reduce, :partition, :group_by, :all?, :one?, :none?, :min, :max, :minmax, :min_by, :max_by, :minmax_by, :member?, :each_with_index, :each_entry, :each_slice, :each_cons, :each_with_object, :chunk, :slice_before, :slice_after, :slice_when, :chunk_while, :lazy, :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?, :class, :singleton_class, :clone, :dup, :itself, :taint, :tainted?, :untaint, :untrust, :trust, :untrusted?, :methods, :protected_methods, :public_methods, :singleton_methods, :!, :!=, :__send__, :equal?, :instance_eval, :instance_exec, :__id__]
irb(main):040:0> nums.methods.class
=> Array
irb(main):041:0> nums
=> [1, 7, 8, 9, 10, 4, 42]
irb(main):042:0> nums.sort
=> [1, 4, 7, 8, 9, 10, 42]
irb(main):043:0> nums.methods.length
=> 176
irb(main):044:0> nums.length
=> 7
irb(main):045:0> nums
=> [1, 7, 8, 9, 10, 4, 42]
irb(main):046:0> nums.each { puts "another num" }
another num
another num
another num
another num
another num
another num
another num
=> [1, 7, 8, 9, 10, 4, 42]
irb(main):047:0> nums.each { |n| puts n }
1
7
8
9
10
4
42
=> [1, 7, 8, 9, 10, 4, 42]
irb(main):048:0> things = { "this" => 42, "that" => 17, "nogot" => nil }
=> {"this"=>42, "that"=>17, "nogot"=>nil}
irb(main):049:0> things["that"]
=> 17
irb(main):050:0> things["missing"]
=> nil
irb(main):051:0> things["num"] = "num"
=> "num"
irb(main):052:0> things
=> {"this"=>42, "that"=>17, "nogot"=>nil, "num"=>"num"}
irb(main):053:0> things.each { puts "another entry" }
another entry
another entry
another entry
another entry
=> {"this"=>42, "that"=>17, "nogot"=>nil, "num"=>"num"}
irb(main):054:0> things.each { |k,v| puts "key is " + k + " and value is " + v }
TypeError: no implicit conversion of Fixnum into String
	from (irb):54:in `+'
	from (irb):54:in `block in irb_binding'
	from (irb):54:in `each'
	from (irb):54
	from /usr/bin/irb:11:in `<main>'
irb(main):055:0> things.each { |k,v| puts "key is " + k.to_s + " and value is " + v.to_s }
key is this and value is 42
key is that and value is 17
key is nogot and value is 
key is num and value is num
=> {"this"=>42, "that"=>17, "nogot"=>nil, "num"=>"num"}
irb(main):056:0> 10.times { puts "have a great weekend" }
have a great weekend
have a great weekend
have a great weekend
have a great weekend
have a great weekend
have a great weekend
have a great weekend
have a great weekend
have a great weekend
have a great weekend
=> 10
irb(main):057:0> ^D
bash-3.2$ exit

Script done on Fri May  7 11:25:00 2021