Add expected outputs when running files.

I used following command to help me so I didn't have to run each file
manually and append the append to the source:

```
find . -iname '*.rb' -exec sh -c 'echo "\n# Result:" >> {}; gtimeout 2 ruby {} 2>&1 | sed "s/^/# /" >> {}' \;
```

associative_arrays.rb

@@ -3,3 +3,7 @@
 
 p aa.assoc("Someone")
 p aa.assoc("Bla")
+
+# Result:
+# ["Someone", "1"]
+# ["Bla", "2"]

autovivification.rb

@@ -3,3 +3,6 @@
 
 deep[:a][:b][:c][:d] = 42
 p deep
+
+# Result:
+# {:a=>{:b=>{:c=>{:d=>42}}}}

blocks_can_take_blocks.rb

@@ -6,3 +6,6 @@
 end
 
 object.show_var_and_block { :block }
+
+# Result:
+# [:var, #<Proc:0x007ffd6c038128@./blocks_can_take_blocks.rb:8>]

bubbling_up_thread_errors.rb

@@ -7,3 +7,6 @@
 loop do
   sleep
 end
+
+# Result:
+# ./bubbling_up_thread_errors.rb:4:in `block in <main>': Ops, we cannot continue (RuntimeError)

case_on_ranges.rb

@@ -9,3 +9,7 @@
   when 65..Float::INFINITY
     p 'You are too old'
 end
+
+# Result:
+# 55
+# "You are at the right age"

count_all_objects.rb

@@ -1,3 +1,23 @@
 require 'pp'
 
 pp ObjectSpace.count_objects
+
+# Result:
+# {:TOTAL=>30163,
+#  :FREE=>1007,
+#  :T_OBJECT=>39,
+#  :T_CLASS=>534,
+#  :T_MODULE=>24,
+#  :T_FLOAT=>4,
+#  :T_STRING=>9290,
+#  :T_REGEXP=>70,
+#  :T_ARRAY=>2231,
+#  :T_HASH=>53,
+#  :T_STRUCT=>1,
+#  :T_BIGNUM=>2,
+#  :T_FILE=>14,
+#  :T_DATA=>966,
+#  :T_MATCH=>1,
+#  :T_COMPLEX=>1,
+#  :T_NODE=>15896,
+#  :T_ICLASS=>30}

cycle.rb

@@ -1,3 +1,6 @@
 ring = %w[one two three].cycle
 
 p ring.take(5)
+
+# Result:
+# ["one", "two", "three", "one", "two"]

easiest_database_pstore.rb

@@ -20,3 +20,10 @@
   p 'People %p' % db['people2']
   p 'Money %p' % db['money2']
 end
+
+# Result:
+# "People \"Someone\""
+# "Money 400"
+# "SECOND PERSON"
+# "People \"Someone2\""
+# "Money 300"

easiest_database_pstore_yaml.rb

@@ -20,3 +20,10 @@
   p 'People %p' % db['people2']
   p 'Money %p' % db['money2']
 end
+
+# Result:
+# "People \"Someone\""
+# "Money 400"
+# "SECOND PERSON"
+# "People \"Someone2\""
+# "Money 300"

enable_ruby_warnings.rb

@@ -9,3 +9,7 @@ def var
 
 p WarnMe.new.var
 
+
+# Result:
+# ./enable_ruby_warnings.rb:5: warning: instance variable @var not initialized
+# 42

fast_memoization_fibonacci.rb

@@ -4,3 +4,6 @@
 
 
 p fibonacci[300]
+
+# Result:
+# 222232244629420445529739893461909967206666939096499764990979600

fetch_data.rb

@@ -6,3 +6,10 @@
 
 params.fetch(:missing)
 
+
+# Result:
+# 42
+# 42
+# 42
+# ./fetch_data.rb:7:in `fetch': key not found: :missing (KeyError)
+# 	from ./fetch_data.rb:7:in `<main>'

get_random_data.rb

@@ -5,3 +5,9 @@
 p
 p SecureRandom.hex(20)
 p SecureRandom.base64(20)
+
+# Result:
+# 0.7851536586163714
+# 46
+# "3efb674fbc2ba390856c15489652e75e8afff6d1"
+# "yFv0WzugzFC6/D71teVe1Y5r1kU="

inject.rb

@@ -1,2 +1,14 @@
 p (1..10).inject{ |r,e| p [r,e]; r*2}
 
+
+# Result:
+# [1, 2]
+# [2, 3]
+# [4, 4]
+# [8, 5]
+# [16, 6]
+# [32, 7]
+# [64, 8]
+# [128, 9]
+# [256, 10]
+# 512

iterating_over_specific_types.rb

@@ -1,3 +1,11 @@
 ObjectSpace.each_object(String) do |object|
   p object
 end
+
+# Result:
+# "block in dependent_specs"
+# "block in dependent_specs"
+# "block (3 levels) in dependent_gems"
+# "block (3 levels) in dependent_gems"
+# ... (huge output suppressed)
+# "This rdoc is bundled with Ruby"

lambda_your_own_syntax.rb

@@ -6,3 +6,6 @@ module Kernel
 
 l = λ { p :called }
 l.call
+
+# Result:
+# :called

print_formatted_with_debug.rb

@@ -4,3 +4,5 @@ def debug(name, content)
 
 debug "Num", 42
 
+# Result:
+# "Num:  42"

ruby_debug_flag.rb

@@ -7,3 +7,9 @@ def var
 end
 
 p var + 2
+
+# Result:
+# ruby_debug_flag.rb:2: warning: instance variable @var not initialized
+# "var is 40"
+# ruby_debug_flag.rb:2: warning: instance variable @var not initialized
+# 42

shortcut_variable_interpolation.rb

@@ -3,3 +3,6 @@
 $global = :global
 
 p "#@instance, #@@class, and #$global variables don't need braces"
+
+# Result:
+# "instance, class, and global variables don't need braces"

struct_without_assignment.rb

@@ -6,3 +6,6 @@ def full
 
 franzejr = Struct::Name.new("Franze", "Jr")
 p franzejr.full
+
+# Result:
+# "Franze Jr"

super_magic_key_word.rb

@@ -11,3 +11,6 @@ def show_args(a,b,c)
 end
 
 Child.new.show_args(:a, :b, :c)
+
+# Result:
+# [:a, :b, :c]

super_magic_key_word2.rb

@@ -12,3 +12,6 @@ def show_args(a,b,c)
 
 #Everything goes up, including the block
 Child.new.show_args(:a, :b, :c) { :block }
+
+# Result:
+# [:a, :b, :c, #<Proc:0x007f9bd288bfb0@./super_magic_key_word2.rb:14>]

super_magic_key_word3.rb

@@ -13,3 +13,6 @@ def show_args(a,b,c)
 
 #Nothing goes up
 Child.new.show_args(:a, :b, :c)
+
+# Result:
+# [nil]

super_magic_key_word4.rb

@@ -13,3 +13,6 @@ def show_args(a,b,c)
 
 #Nothing goes up, neither the block
 Child.new.show_args(:a, :b, :c) { :block }
+
+# Result:
+# [nil]

super_magic_key_word5.rb

@@ -13,3 +13,7 @@ def delegate
 
 p DelegateToMe.new.extend(DelegateIfCan).delegate
 p DontDelegateToMe.new.extend(DelegateIfCan).delegate
+
+# Result:
+# "Modified:  DelegateToMe"
+# "DelegateIfCan"

tail_call.rb

@@ -12,3 +12,5 @@ def factorial(n, result=1)
 end
 
 p factorial(100000)
+
+# Result:

trigger_irb_as_needed.rb

@@ -13,3 +13,7 @@ def my_program_context
   p "Current value: #{my_program_context.value}"
   sleep 1
 end
+
+# Result:
+# "Current value: 40"
+# "Current value: 40"

unused_variable_format.rb

@@ -5,3 +5,8 @@
   ].each do |name,_,_|
     p name
   end
+
+# Result:
+# "Someone"
+# "Someone2"
+# "Someone3"

variables_from_a_regex.rb

@@ -1,3 +1,6 @@
 if  /\A(?<first>\w+),\s*(?<last>\w+)\z/ =~ "Franze, Jr"
   puts "#{first} #{last}"
 end
+
+# Result:
+# Franze Jr

zip.rb

@@ -4,3 +4,9 @@
 letters.zip(numbers) do |letter, number|
   p(letter: letter, number: number)
 end
+
+# Result:
+# {:letter=>"a", :number=>1}
+# {:letter=>"b", :number=>2}
+# {:letter=>"c", :number=>3}
+# {:letter=>"d", :number=>nil}