diff --git a/associative_arrays.rb b/associative_arrays.rb
new file mode 100644
index 0000000..215cf5b
--- /dev/null
+++ b/associative_arrays.rb
@@ -0,0 +1,5 @@
+aa = [ %w[Someone 1],
+      %w[Bla 2]]
+
+p aa.assoc("Someone")
+p aa.assoc("Bla")
diff --git a/autovivification.rb b/autovivification.rb
new file mode 100644
index 0000000..449fbfe
--- /dev/null
+++ b/autovivification.rb
@@ -0,0 +1,5 @@
+deep = Hash.new { |hash,key| hash[key] = Hash.new(&hash.default_proc) }
+
+
+deep[:a][:b][:c][:d] = 42
+p deep
diff --git a/blocks_can_take_blocks.rb b/blocks_can_take_blocks.rb
new file mode 100644
index 0000000..cad30bb
--- /dev/null
+++ b/blocks_can_take_blocks.rb
@@ -0,0 +1,8 @@
+var = :var
+object = Object.new
+
+object.define_singleton_method(:show_var_and_block) do |&block|
+  p [var, block]
+end
+
+object.show_var_and_block { :block }
diff --git a/bubbling_up_thread_errors.rb b/bubbling_up_thread_errors.rb
new file mode 100644
index 0000000..a80ee7e
--- /dev/null
+++ b/bubbling_up_thread_errors.rb
@@ -0,0 +1,9 @@
+Thread.abort_on_exception = true
+
+Thread.new do
+  fail 'Ops, we cannot continue'
+end
+
+loop do
+  sleep
+end
diff --git a/case_on_ranges.rb b/case_on_ranges.rb
new file mode 100644
index 0000000..fe0eb4e
--- /dev/null
+++ b/case_on_ranges.rb
@@ -0,0 +1,11 @@
+age = rand(1..100)
+p age
+
+case age
+  when -Float::INFINITY..20
+    p 'You are too young'
+  when 21..64
+    p 'You are at the right age'
+  when 65..Float::INFINITY
+    p 'You are too old'
+end
diff --git a/count_all_objects.rb b/count_all_objects.rb
new file mode 100644
index 0000000..9884c05
--- /dev/null
+++ b/count_all_objects.rb
@@ -0,0 +1,3 @@
+require 'pp'
+
+pp ObjectSpace.count_objects
diff --git a/cycle.rb b/cycle.rb
new file mode 100644
index 0000000..21a5605
--- /dev/null
+++ b/cycle.rb
@@ -0,0 +1,3 @@
+ring = %w[one two three].cycle
+
+p ring.take(5)
diff --git a/data.rb b/data.rb
new file mode 100644
index 0000000..f9ed72b
--- /dev/null
+++ b/data.rb
@@ -0,0 +1,5 @@
+puts DATA.read
+
+__END__
+Hey oh!
+Hey oh!
diff --git a/easiest_database_pstore.rb b/easiest_database_pstore.rb
new file mode 100644
index 0000000..2f7d2cc
--- /dev/null
+++ b/easiest_database_pstore.rb
@@ -0,0 +1,22 @@
+require 'pstore'
+
+db = PStore.new('mydatabase.pstore')
+
+db.transaction do
+  db['people1'] = 'Someone'
+  db['money1'] = 400
+end
+
+db.transaction do
+  db['people2'] = 'Someone2'
+  db['money2'] = 300
+end
+
+
+db.transaction(true) do
+  p 'People %p' % db['people1']
+  p 'Money %p' % db['money1']
+  p "SECOND PERSON"
+  p 'People %p' % db['people2']
+  p 'Money %p' % db['money2']
+end
diff --git a/easiest_database_pstore_yaml.rb b/easiest_database_pstore_yaml.rb
new file mode 100644
index 0000000..8dab8a2
--- /dev/null
+++ b/easiest_database_pstore_yaml.rb
@@ -0,0 +1,22 @@
+require 'yaml/store'
+
+db = YAML::Store.new('people.yml')
+
+db.transaction do
+  db['people1'] = 'Someone'
+  db['money1'] = 400
+end
+
+db.transaction do
+  db['people2'] = 'Someone2'
+  db['money2'] = 300
+end
+
+
+db.transaction(true) do
+  p 'People %p' % db['people1']
+  p 'Money %p' % db['money1']
+  p "SECOND PERSON"
+  p 'People %p' % db['people2']
+  p 'Money %p' % db['money2']
+end
diff --git a/email.txt b/email.txt
new file mode 100644
index 0000000..0cf735b
--- /dev/null
+++ b/email.txt
@@ -0,0 +1,5 @@
+#! /usr/bin/env ruby -w
+
+puts "This is one email"
+
+__END__
diff --git a/enable_ruby_warnings.rb b/enable_ruby_warnings.rb
new file mode 100644
index 0000000..8dcfd42
--- /dev/null
+++ b/enable_ruby_warnings.rb
@@ -0,0 +1,11 @@
+$VERBOSE = true
+
+class WarnMe
+  def var
+    @var || 42
+  end
+end
+
+
+p WarnMe.new.var
+
diff --git a/fast_memoization_fibonacci.rb b/fast_memoization_fibonacci.rb
new file mode 100644
index 0000000..8fe5e9b
--- /dev/null
+++ b/fast_memoization_fibonacci.rb
@@ -0,0 +1,6 @@
+fibonacci = Hash.new{ |numbers,index|
+  numbers[index] = fibonacci[index - 2] + fibonacci[index - 1]
+}.update(0 => 0, 1 => 1)
+
+
+p fibonacci[300]
diff --git a/fetch_data.rb b/fetch_data.rb
new file mode 100644
index 0000000..c86ff24
--- /dev/null
+++ b/fetch_data.rb
@@ -0,0 +1,8 @@
+params = {var: 42}
+
+p params.fetch(:var)
+p params.fetch(:missing, 42)
+p params.fetch(:missing) { 40 + 2 }
+
+params.fetch(:missing)
+
diff --git a/get_random_data.rb b/get_random_data.rb
new file mode 100644
index 0000000..46377b1
--- /dev/null
+++ b/get_random_data.rb
@@ -0,0 +1,7 @@
+require 'securerandom'
+
+p SecureRandom.random_number
+p SecureRandom.random_number(100)
+p
+p SecureRandom.hex(20)
+p SecureRandom.base64(20)
diff --git a/inject.rb b/inject.rb
new file mode 100644
index 0000000..fd21b34
--- /dev/null
+++ b/inject.rb
@@ -0,0 +1,2 @@
+p (1..10).inject{ |r,e| p [r,e]; r*2}
+
diff --git a/inspecting_the_source_with_script_lines.rb b/inspecting_the_source_with_script_lines.rb
new file mode 100644
index 0000000..e119076
--- /dev/null
+++ b/inspecting_the_source_with_script_lines.rb
@@ -0,0 +1,8 @@
+SCRIPT_LINES__ = { }
+
+#require_relative = 'better_be_well_formed_code'
+require_relative = 'better_be_well_formed_code_with_a_line_size_greather_than_80_it_is_not_good'
+
+if SCRIPT_LINES__.values.flatten.any? { |line| line.size > 80}
+  abort 'Clean up your code first!'
+end
diff --git a/iterating_over_specific_types.rb b/iterating_over_specific_types.rb
new file mode 100644
index 0000000..baa046e
--- /dev/null
+++ b/iterating_over_specific_types.rb
@@ -0,0 +1,3 @@
+ObjectSpace.each_object(String) do |object|
+  p object
+end
diff --git a/lambda_your_own_syntax.rb b/lambda_your_own_syntax.rb
new file mode 100644
index 0000000..a541bcc
--- /dev/null
+++ b/lambda_your_own_syntax.rb
@@ -0,0 +1,8 @@
+# encoding UTF-8
+
+module Kernel
+  alias_method :λ, :lambda
+end
+
+l = λ { p :called }
+l.call
diff --git a/mydatabase.pstore b/mydatabase.pstore
new file mode 100644
index 0000000..04203fa
Binary files /dev/null and b/mydatabase.pstore differ
diff --git a/people.yml b/people.yml
new file mode 100644
index 0000000..ee7a285
--- /dev/null
+++ b/people.yml
@@ -0,0 +1,5 @@
+---
+people1: Someone
+money1: 400
+people2: Someone2
+money2: 300
diff --git a/print_formatted_with_debug.rb b/print_formatted_with_debug.rb
new file mode 100644
index 0000000..00cdba4
--- /dev/null
+++ b/print_formatted_with_debug.rb
@@ -0,0 +1,6 @@
+def debug(name, content)
+  p "%s:  %p" % [name, content]
+end
+
+debug "Num", 42
+
diff --git a/ruby_can_even_explain_it_to_you.txt b/ruby_can_even_explain_it_to_you.txt
new file mode 100644
index 0000000..4349c5d
--- /dev/null
+++ b/ruby_can_even_explain_it_to_you.txt
@@ -0,0 +1,2 @@
+ruby -e 'puts { is_this_a_block }' --dump parsetree
+ruby -e 'puts { is_this_a_block }' --dump parsetree_with_comment
diff --git a/ruby_debug_flag.rb b/ruby_debug_flag.rb
new file mode 100644
index 0000000..c059f9d
--- /dev/null
+++ b/ruby_debug_flag.rb
@@ -0,0 +1,9 @@
+def var
+  @var || 40
+end
+
+if $DEBUG
+  p "var is %p" % var
+end
+
+p var + 2
diff --git a/shortcut_variable_interpolation.rb b/shortcut_variable_interpolation.rb
new file mode 100644
index 0000000..46999f2
--- /dev/null
+++ b/shortcut_variable_interpolation.rb
@@ -0,0 +1,5 @@
+@instance = :instance
+@@class = :class
+$global = :global
+
+p "#@instance, #@@class, and #$global variables don't need braces"
diff --git a/single_instance_running.rb b/single_instance_running.rb
new file mode 100644
index 0000000..c75ed86
--- /dev/null
+++ b/single_instance_running.rb
@@ -0,0 +1,10 @@
+DATA.flock(File::LOCK_EX | File::LOCK_NB) or abort 'Already running'
+
+trap('INT', 'EXIT')
+puts 'Running...'
+loop do
+  sleep
+end
+
+__END__
+DO NOT DELETE: used for locking
diff --git a/struct_without_assignment.rb b/struct_without_assignment.rb
new file mode 100644
index 0000000..68ccbec
--- /dev/null
+++ b/struct_without_assignment.rb
@@ -0,0 +1,8 @@
+Struct.new("Name", :first, :last) do
+  def full
+    "#{first} #{last}"
+  end
+end
+
+franzejr = Struct::Name.new("Franze", "Jr")
+p franzejr.full
diff --git a/super_magic_key_word.rb b/super_magic_key_word.rb
new file mode 100644
index 0000000..a05372d
--- /dev/null
+++ b/super_magic_key_word.rb
@@ -0,0 +1,13 @@
+class Parent
+  def show_args(*args)
+    p args
+  end
+end
+
+class Child < Parent
+  def show_args(a,b,c)
+    super(a,b,c)
+  end
+end
+
+Child.new.show_args(:a, :b, :c)
diff --git a/super_magic_key_word2.rb b/super_magic_key_word2.rb
new file mode 100644
index 0000000..d12674d
--- /dev/null
+++ b/super_magic_key_word2.rb
@@ -0,0 +1,14 @@
+class Parent
+  def show_args(*args, &block)
+    p [*args, block]
+  end
+end
+
+class Child < Parent
+  def show_args(a,b,c)
+    super
+  end
+end
+
+#Everything goes up, including the block
+Child.new.show_args(:a, :b, :c) { :block }
diff --git a/super_magic_key_word3.rb b/super_magic_key_word3.rb
new file mode 100644
index 0000000..453a5bb
--- /dev/null
+++ b/super_magic_key_word3.rb
@@ -0,0 +1,15 @@
+class Parent
+  def show_args(*args, &block)
+    p [*args, block]
+  end
+end
+
+class Child < Parent
+  def show_args(a,b,c)
+    #modify super by passing nothing
+    super()
+  end
+end
+
+#Nothing goes up
+Child.new.show_args(:a, :b, :c)
diff --git a/super_magic_key_word4.rb b/super_magic_key_word4.rb
new file mode 100644
index 0000000..a2160d1
--- /dev/null
+++ b/super_magic_key_word4.rb
@@ -0,0 +1,15 @@
+class Parent
+  def show_args(*args, &block)
+    p [*args, block]
+  end
+end
+
+class Child < Parent
+  def show_args(a,b,c)
+    #modify super by passing nothing
+    super(&nil)
+  end
+end
+
+#Nothing goes up, neither the block
+Child.new.show_args(:a, :b, :c) { :block }
diff --git a/super_magic_key_word5.rb b/super_magic_key_word5.rb
new file mode 100644
index 0000000..b24abf0
--- /dev/null
+++ b/super_magic_key_word5.rb
@@ -0,0 +1,15 @@
+class DontDelegateToMe; end
+class DelegateToMe; def delegate; "DelegateToMe" end end
+
+module DelegateIfCan
+  def delegate
+    if defined? super
+      "Modified:  #{super}"
+    else
+      "DelegateIfCan"
+    end
+  end
+end
+
+p DelegateToMe.new.extend(DelegateIfCan).delegate
+p DontDelegateToMe.new.extend(DelegateIfCan).delegate
diff --git a/tail_call.rb b/tail_call.rb
new file mode 100644
index 0000000..842fd4d
--- /dev/null
+++ b/tail_call.rb
@@ -0,0 +1,14 @@
+RubyVM::InstructionSequence.compile_option = { tailcall_optimization: true,
+                                               trace_instruction: false }
+
+eval <<end
+  def factorial(n, result=1)
+    if n==1
+      result
+    else
+      factorial(n-1, n*result)
+    end
+  end
+end
+
+p factorial(100000)
diff --git a/trigger_irb_as_needed.rb b/trigger_irb_as_needed.rb
new file mode 100644
index 0000000..5e6d042
--- /dev/null
+++ b/trigger_irb_as_needed.rb
@@ -0,0 +1,15 @@
+require 'irb'
+
+def my_program_context
+  @my_program_context ||= Struct.new(:value).new(40)
+end
+
+trap(:INT) do
+  IRB.start
+  trap(:INT, 'EXIT')
+end
+
+loop do
+  p "Current value: #{my_program_context.value}"
+  sleep 1
+end
diff --git a/turn_on_garbage_collector.rb b/turn_on_garbage_collector.rb
new file mode 100644
index 0000000..8f360c7
--- /dev/null
+++ b/turn_on_garbage_collector.rb
@@ -0,0 +1,7 @@
+GC::Profiler.enable
+
+10.times do
+  array = Array.new(1_000_000) { |i| i.to_s }
+end
+
+p GC::Profiler.result
diff --git a/unused_variable_format.rb b/unused_variable_format.rb
new file mode 100644
index 0000000..dcce1c2
--- /dev/null
+++ b/unused_variable_format.rb
@@ -0,0 +1,7 @@
+  [
+    ['Someone', 41, 'another field'],
+    ['Someone2', 42, 'another field2'],
+    ['Someone3', 43, 'another field3']
+  ].each do |name,_,_|
+    p name
+  end
diff --git a/variables_from_a_regex.rb b/variables_from_a_regex.rb
new file mode 100644
index 0000000..8fedf7e
--- /dev/null
+++ b/variables_from_a_regex.rb
@@ -0,0 +1,3 @@
+if  /\A(?<first>\w+),\s*(?<last>\w+)\z/ =~ "Franze, Jr"
+  puts "#{first} #{last}"
+end
diff --git a/zip.rb b/zip.rb
new file mode 100644
index 0000000..a71a00d
--- /dev/null
+++ b/zip.rb
@@ -0,0 +1,6 @@
+letters = "a".."d"
+numbers = 1..3
+
+letters.zip(numbers) do |letter, number|
+  p(letter: letter, number: number)
+end