From 46c0077d912a06949413f19448c13e28f5fa7d96 Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sat, 10 Sep 2016 13:09:13 +0100
Subject: [PATCH 01/15] Chapter 09

---
 ch09-writing-your-own-methods/ask.rb          | 12 +++++-
 .../old_school_roman_numerals.rb              | 17 ++++++++-
 .../roman_numerals.rb                         | 38 ++++++++++++++++++-
 3 files changed, 62 insertions(+), 5 deletions(-)

diff --git a/ch09-writing-your-own-methods/ask.rb b/ch09-writing-your-own-methods/ask.rb
index 01716eb35..60fd86d00 100644
--- a/ch09-writing-your-own-methods/ask.rb
+++ b/ch09-writing-your-own-methods/ask.rb
@@ -1,3 +1,13 @@
 def ask question
-  # your code here
+    while true
+        puts question
+        reply = gets.chomp.downcase
+        if reply == "yes"
+            return true
+            elsif reply == "no"
+            return false
+            else
+            puts "Please answer 'yes' or 'no.'"
+        end
+    end
 end
\ No newline at end of file
diff --git a/ch09-writing-your-own-methods/old_school_roman_numerals.rb b/ch09-writing-your-own-methods/old_school_roman_numerals.rb
index ca6589f2d..5f8b2c2f3 100644
--- a/ch09-writing-your-own-methods/old_school_roman_numerals.rb
+++ b/ch09-writing-your-own-methods/old_school_roman_numerals.rb
@@ -1,3 +1,16 @@
 def old_roman_numeral num
-  # your code here
-end
\ No newline at end of file
+    # your code here
+    roman = ""
+    roman = roman + "M" * (num / 1000)
+    roman = roman + "D" * ((num % 1000) / 500)
+    roman = roman + "C" * ((num % 500) / 100)
+    roman = roman + "L" * ((num % 100) / 50)
+    roman = roman + "X" * ((num % 50) / 10)
+    roman = roman + "V" * ((num % 10) / 5)
+    roman = roman + "I" * ((num % 5) / 1)
+    
+    roman
+    
+end
+
+puts(old_roman_numeral(2498))
\ No newline at end of file
diff --git a/ch09-writing-your-own-methods/roman_numerals.rb b/ch09-writing-your-own-methods/roman_numerals.rb
index 5c93b59ac..a5c1a0fe8 100644
--- a/ch09-writing-your-own-methods/roman_numerals.rb
+++ b/ch09-writing-your-own-methods/roman_numerals.rb
@@ -1,3 +1,37 @@
 def roman_numeral num
-  # your code here
-end
\ No newline at end of file
+    roman = ""
+    roman = roman + "M" * (num / 1000)
+    if (900..999) === (num % 1000)
+        roman = roman + "CM"
+        elsif (400..499) === (num  % 500)
+        roman = roman + "CD"
+        else
+        roman = roman + "D" * ((num % 1000) / 500)
+        roman = roman + "C" * ((num % 500) / 100)
+    end
+    if (90..99) === (num % 100)
+        roman = roman + "XC"
+        elsif
+        (40..49) === (num % 50)
+        roman = roman + "XL"
+        else
+        roman = roman + "L" * ((num % 100) / 50)
+        roman = roman + "X" * ((num % 50) / 10)
+    end
+    if (num % 10) == 9
+        roman = roman + "IX"
+        elsif (num % 5) == 4
+        roman = roman + "IV"
+        else
+        roman = roman + "V" * ((num % 10) / 5)
+        roman = roman + "I" * ((num % 5) / 1)
+    end
+    puts roman
+end
+
+puts(roman_numeral(1999))
+puts(roman_numeral(2469))
+puts(roman_numeral(1378))
+puts(roman_numeral(5))
+puts(roman_numeral(497))
+puts(roman_numeral(949))
\ No newline at end of file

From 314d4db3f7b163df1853509e486e31a4f923ee44 Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sat, 10 Sep 2016 13:21:17 +0100
Subject: [PATCH 02/15] Chapter 10.a

---
 ch10-nothing-new/Rite_passage.rb | 24 ++++++++++++++++++++++++
 ch10-nothing-new/shuffle.rb      | 25 +++++++++++++++++++++++--
 2 files changed, 47 insertions(+), 2 deletions(-)
 create mode 100644 ch10-nothing-new/Rite_passage.rb

diff --git a/ch10-nothing-new/Rite_passage.rb b/ch10-nothing-new/Rite_passage.rb
new file mode 100644
index 000000000..18ce2af29
--- /dev/null
+++ b/ch10-nothing-new/Rite_passage.rb
@@ -0,0 +1,24 @@
+def some_array
+  recursive_sort some_array, []
+end
+
+def recursive_sort unsorted_array, sorted_array
+  if unsorted.length <= 0
+    return "Sorted"
+  end
+
+  smallest = unsorted_array.pop
+  still_unsorted =[]
+
+  unsorted_array each do |tested|
+    if tested < smallest
+      still_unsorted.push smallest
+      smallest = tested 
+    else
+      still_unsorted.push tested
+    end
+  end
+
+  sorted_array.push smallest
+
+end
diff --git a/ch10-nothing-new/shuffle.rb b/ch10-nothing-new/shuffle.rb
index a486ad94c..b21b159ba 100644
--- a/ch10-nothing-new/shuffle.rb
+++ b/ch10-nothing-new/shuffle.rb
@@ -1,3 +1,24 @@
 def shuffle arr
-  # your code here
-end
\ No newline at end of file
+    shuffled = []
+    while arr.length > 0
+        rand_index = rand(arr.length)
+        
+        curr_index = 0
+        new_array =[]
+        
+        arr.each do |item|
+            if curr_index == rand_index
+                shuffled.push item
+                else
+                new_array.push item
+            end
+            
+            curr_index = curr_index + 1
+        end
+        
+        arr = new_array
+    end
+    shuffled
+end
+
+puts shuffle [1, 2, 3, 4, 5, 6, 7]
\ No newline at end of file

From 130fa0e73a372b47fe5be9d23c96f2e59fca3372 Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sat, 10 Sep 2016 13:30:17 +0100
Subject: [PATCH 03/15] Chapter 11.a

---
 .../build_your_own_playlist.rb                |  8 ++++++-
 .../safer_picture_downloading.rb              | 24 ++++++++++++++++++-
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/ch11-reading-and-writing/build_your_own_playlist.rb b/ch11-reading-and-writing/build_your_own_playlist.rb
index 801de24bd..35e13bd10 100644
--- a/ch11-reading-and-writing/build_your_own_playlist.rb
+++ b/ch11-reading-and-writing/build_your_own_playlist.rb
@@ -1 +1,7 @@
-# your code here
\ No newline at end of file
+# your code here
+songs = shuffle(Dir["**/*.mp3"])
+File.open 'playlist.m3u', 'w' do |f|
+    songs.each do |mp3|
+        f.write mp3 + "/n"
+    end
+end
\ No newline at end of file
diff --git a/ch11-reading-and-writing/safer_picture_downloading.rb b/ch11-reading-and-writing/safer_picture_downloading.rb
index 801de24bd..697db3fb8 100644
--- a/ch11-reading-and-writing/safer_picture_downloading.rb
+++ b/ch11-reading-and-writing/safer_picture_downloading.rb
@@ -1 +1,23 @@
-# your code here
\ No newline at end of file
+pic_names = Dir["**/*.{JPG,jpg}"]
+puts "How would you want to call this batch?"
+batch_name = gets.chomp
+puts
+puts "Downloading #{pic_names.length} files"
+pic_number = 1
+pic_names.each do |name|
+    print "."
+    new_name = if pic_number < 10
+    "#{batch_name}0#{pic_number}.jpg"
+    else
+    "#{batch_name}#{pic_number}.jpg"
+end
+if File.exist?(new_name) == true
+    puts "Sorry, but you would be overwriting a picture!"
+    exit
+    else
+    File.rename name, new_name
+    pic_number = pic_number + 1
+end
+end
+
+puts "Your batch have been saved with the following name: #{batch_name}!"
\ No newline at end of file

From 98eed07f9b40fac5dd0f9777536b6e04f9847ef5 Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sat, 10 Sep 2016 13:33:25 +0100
Subject: [PATCH 04/15] Chapter 12.a

---
 ch12-new-classes-of-objects/happy_birthday.rb   | 17 +++++++++++++++++
 .../one_billion_seconds.rb                      |  5 ++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/ch12-new-classes-of-objects/happy_birthday.rb b/ch12-new-classes-of-objects/happy_birthday.rb
index 801de24bd..29b2212f4 100644
--- a/ch12-new-classes-of-objects/happy_birthday.rb
+++ b/ch12-new-classes-of-objects/happy_birthday.rb
@@ -1 +1,18 @@
+puts "Which year did you get born?"
+year = gets.chomp.to_i
+puts "Which month did you get born? Please give it in a numerical way (1-12)"
+month = gets.chomp.to_i
+puts "Which day did you get born?"
+day = gets.chomp.to_i
+
+
+birthday = Time.local(year, month, day)
+older = 1
+now = Time.new
+
+
+while Time.local(year + older, month, day) < now
+    puts "PRANK!!"
+    older = older + 1
+end
 # your code here
\ No newline at end of file
diff --git a/ch12-new-classes-of-objects/one_billion_seconds.rb b/ch12-new-classes-of-objects/one_billion_seconds.rb
index 801de24bd..8391fff35 100644
--- a/ch12-new-classes-of-objects/one_billion_seconds.rb
+++ b/ch12-new-classes-of-objects/one_billion_seconds.rb
@@ -1 +1,4 @@
-# your code here
\ No newline at end of file
+time = Time.gm(1989, 5, 18)
+time2 = time + 1000000000
+puts time
+puts time2

From 4abe3bd531b18c34b7c87ffb18c4eac93bf65b0d Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sat, 10 Sep 2016 19:30:04 +0100
Subject: [PATCH 05/15] Roman numerals corrected

---
 ch09-writing-your-own-methods/roman_numerals.rb | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/ch09-writing-your-own-methods/roman_numerals.rb b/ch09-writing-your-own-methods/roman_numerals.rb
index a5c1a0fe8..5cc8ed29d 100644
--- a/ch09-writing-your-own-methods/roman_numerals.rb
+++ b/ch09-writing-your-own-methods/roman_numerals.rb
@@ -26,12 +26,5 @@ def roman_numeral num
         roman = roman + "V" * ((num % 10) / 5)
         roman = roman + "I" * ((num % 5) / 1)
     end
-    puts roman
+    roman
 end
-
-puts(roman_numeral(1999))
-puts(roman_numeral(2469))
-puts(roman_numeral(1378))
-puts(roman_numeral(5))
-puts(roman_numeral(497))
-puts(roman_numeral(949))
\ No newline at end of file

From 45971e0d988c19eb12bec18638b443dd8a63f90a Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 00:25:15 +0100
Subject: [PATCH 06/15] Chapter 13

---
 .../extend_built_in_classes.rb                |  46 ++++++-
 .../interactive_baby_dragon.rb                | 122 +++++++++++++++++-
 ch13-creating-new-classes/orange_tree.rb      |  52 +++++++-
 3 files changed, 216 insertions(+), 4 deletions(-)

diff --git a/ch13-creating-new-classes/extend_built_in_classes.rb b/ch13-creating-new-classes/extend_built_in_classes.rb
index c3e793933..1be1097c1 100644
--- a/ch13-creating-new-classes/extend_built_in_classes.rb
+++ b/ch13-creating-new-classes/extend_built_in_classes.rb
@@ -1,3 +1,45 @@
 class Integer
-  # your code here
-end
\ No newline at end of file
+  def factorial
+    if self <= 1
+      1
+    else
+      self * (self - 1).factorial
+    end
+  end
+
+  def roman
+    roman = ""
+    roman = roman + "M" * (self / 1000)
+    roman = roman + "D" * (self % 1000 / 500)
+    roman = roman + "C" * (self % 500 / 100)
+    roman = roman + "L" * (self % 100 / 50)
+    roman = roman + "X" * (self % 50 / 10)
+    roman = roman + "V" * (self % 10 / 5)
+    roman = roman + "D" * (self % 5 / 1)
+  end
+end
+
+class Array
+  def shuffle
+    arr = self
+    shuffled = []
+    while arr.length > 0
+        rand_index = rand(arr.length)
+
+        curr_index = 0
+        new_array =[]
+
+        arr.each do |item|
+            if curr_index == rand_index
+                shuffled.push item
+                else
+                new_array.push item
+            end
+
+            curr_index = curr_index + 1
+        end
+
+        arr = new_array
+    end
+    shuffled
+end
diff --git a/ch13-creating-new-classes/interactive_baby_dragon.rb b/ch13-creating-new-classes/interactive_baby_dragon.rb
index 801de24bd..d94fb64da 100644
--- a/ch13-creating-new-classes/interactive_baby_dragon.rb
+++ b/ch13-creating-new-classes/interactive_baby_dragon.rb
@@ -1 +1,121 @@
-# your code here
\ No newline at end of file
+class dragon # creates class dragon
+  def initialize name # initializes an instance of dragon called by its name
+    @name = name.capitalize # instance variable name is equal name of the dragon
+    @stuff_in_belly = 10
+    @stuff_in_intestine = 0
+
+    puts "#{@name} is born."
+  end
+
+  def feed
+    puts "#{@name} has been fed, and is so happy now"
+    @stuff_in_belly = 10
+    passage_of_time
+  end
+
+  def walk
+    puts "#{@name} has enjoyed his walk!"
+    @stuff_in_intestine = 0
+    passage_of_time
+  end
+
+  def put_to_bed
+    puts "#{@name} seemed tired and you put him to sleep"
+    @asleep = true
+    3.times do
+      if @asleep
+        passage_of_time
+      end
+      if @asleep
+        puts "#{@name} snores, filling the room with smoke"
+      end
+    end
+    if @asleep
+      @asleep = false
+      puts "#{@name} wakes up slowly"
+    end
+  end
+  def toss
+    puts "You toss #{@name} up into the air"
+    puts "He giggles, which singes your eyebrows..."
+    passage_of_time
+  end
+  def rock
+    puts "You rock #{@name} gently."
+    @asleep = true
+    puts "He briefly dozes off..."
+    passage_of_time
+    if @asleep
+      @asleep = false
+      puts "...but wakes when you stop."
+    end
+  end
+
+  private
+
+  def hungy?
+    @stuff_in_belly <= 2
+  end
+  def poopy?
+    @stuff_in_intestine >=8
+  end
+
+  def passage_of_time
+    if @stuff_in_belly > 0
+      @stuff_in_belly = @stuff_in_belly - 1
+      @stuff_in_intestine = @stuff_in_intestine + 1
+    else
+      if @asleep
+        @asleep = false
+        puts "He wakes up suddenly!"
+      end
+      puts "#{@name} is starving! In desperation he hates YOU!"
+      exit # This quit the program
+    end
+    if @stuff_in_intestine >= 10
+      @stuff_in_intestine = 0
+      puts "Whooops! #{@name} had an accident..."
+    end
+    if hungry?
+      if @asleep
+        @asleep = false
+        puts "He wakes up suddenly!"
+      end
+      puts "#{@name}'s stomach grimbles..."
+    end
+    if poppy?
+      if @asleep
+        @asleep = false
+        puts "#{@name} wakes up suddenly!"
+      end
+      puts "#{@name} does the potty dance... someone needs a walk!"
+    end
+  end
+end
+
+puts "Hello sir, what's the name of your new little dragon?"
+name = gets.chomp.capitalize
+pet = Dragon.new name
+
+
+while true
+  puts
+  puts "Possible commands for your baby dragon: feed, toss, walk" +
+  puts " rock, put to bed, exit."
+  command = gets.chomp.downcase
+  if command == "exit"
+    exit
+  elsif == "feed"
+    pet.feed
+  elsif == "toss"
+    pet.toss
+  elsif == walk
+    pet.walk
+  elsif == rock
+    pet.rock
+  elsif == put to bed
+    pet.put_to_bed
+  else
+    puts "Please, choose one of the dragon commands."
+  end
+end
diff --git a/ch13-creating-new-classes/orange_tree.rb b/ch13-creating-new-classes/orange_tree.rb
index 025d08907..d04f05a1a 100644
--- a/ch13-creating-new-classes/orange_tree.rb
+++ b/ch13-creating-new-classes/orange_tree.rb
@@ -7,5 +7,55 @@
 
 
 class OrangeTree
-  # your code here
+  def initialize
+    @height = 0
+    @orange_count = 0
+    @alive = true
+  end
+  def height
+    if @alive
+      @height
+    else
+      "A dead tree is not very tall. :("
+    end
+  end
+  def count_the_oranges
+    if @alive
+      @orange_count
+    else
+      "A dead tree has no oranges. :("
+    end
+  end
+
+  def one_year_passes
+    if @alive
+      @height = @height + 0.4
+      @orange_count = 0
+      if @height > 10 && rand(2) > 0
+        @alive = false
+        "Oh no! The tree is too old, and has died! :("
+      elsif @height > 2
+        @orange_count = (@height * 15 - 25).to_i
+        "This year your tree grew to #{@height} m tall," +
+        " and produced #{@orange_count} oranges."
+      else
+        "This year your tree grew to #{@height} m tall," +
+        " but is still too young to bear fruit."
+      end
+    else
+      "A year later, the tree is still dead. :("
+    end
+  end
+  def pick_an_orange
+    if @alive
+      if @orange_count > 0
+        @orange_count = @orange_count - 1
+        "You pick a juicy, delicious orange!"
+      else
+        "You search every branch, but find no oranges."
+      end
+    else
+      "A dead tree has nothing to pick. :("
+    end
+  end
 end

From 17cbfedc2914e671f0b9abbf14ed4794dea0e564 Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 19:05:42 +0100
Subject: [PATCH 07/15] Chapter 10.b

---
 ch10-nothing-new/dictionary_sort.rb           | 22 ++++++-
 ch10-nothing-new/english_number.rb            | 57 ++++++++++++++++++-
 .../ninety_nine_bottles_of_beer.rb            | 15 ++++-
 ch10-nothing-new/sort.rb                      | 25 +++++++-
 4 files changed, 113 insertions(+), 6 deletions(-)

diff --git a/ch10-nothing-new/dictionary_sort.rb b/ch10-nothing-new/dictionary_sort.rb
index c9893d0fd..5b85ffecd 100644
--- a/ch10-nothing-new/dictionary_sort.rb
+++ b/ch10-nothing-new/dictionary_sort.rb
@@ -1,3 +1,21 @@
 def dictionary_sort arr
-  # your code here
-end
\ No newline at end of file
+  rec_dict_sort arr, []
+end
+def rec_dict_sort unsorted, sorted
+  if unsorted.length <= 0
+    return sorted
+  end
+  smallest = unsorted.pop
+  still_unsorted = []
+
+  unsorted.each do |tested|
+    if tested.downcase < smallest.downcase
+      still_unsorted.push smallest
+      smallest = tested
+    else
+      still_unsorted.push tested
+    end
+  end
+  sorted.push smallest
+  rec_dict_sort still_unsorted, sorted
+end
diff --git a/ch10-nothing-new/english_number.rb b/ch10-nothing-new/english_number.rb
index c0129bc4e..1fef793e6 100644
--- a/ch10-nothing-new/english_number.rb
+++ b/ch10-nothing-new/english_number.rb
@@ -1,3 +1,58 @@
 def english_number number
-  # your code here
+  if number < 0
+    return "Please enter a number that isn't negative."
+  end
+  if number == 0
+    return "zero"
+  end
+  num_string = ""
+  ones_place = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
+  tens_place = ["ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
+  teenagers = ["eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
+  zillions =[["hundred", 2], ["thousand", 3], ["million", 6], ["billion", 9], ["trillion", 12],
+            ["quadrillion", 15], ["quintillion", 18], ["sextillion", 21], ['septillion', 24],
+            ['octillion', 27], ['nonillion', 30], ['decillion', 33], ['undecillion', 36],
+            ['duodecillion', 39], ['tredecillion', 42], ['quattuordecillion', 45], ['quindecillion', 48],
+            ['sexdecillion', 51], ['septendecillion', 54], ['octodecillion', 57], ['novemdecillion', 60],
+            ['vigintillion', 63], ['googol', 100]]
+  left = number
+  while zillions.length > 0
+    zil_pair = zillions.pop
+    zil_name = zil_pair[0]
+    zil_base = 10 ** zil_pair[1]
+    write = left/zil_base
+    left = left - write * zil_base
+
+    if write > 0
+      prefix = english_number write
+      num_string = num_string + prefix + " " + zil_name
+
+      if left > 0
+        num_string = num_string + " "
+      end
+    end
+  end
+  write = left / 10
+  left = left - write * 10
+
+  if write > 0
+    if ((write == 1) and (left > 0))
+      num_string = num_string + teenagers[left - 1]
+      left = 0
+    else
+      num_string = num_string + tens_place[write - 1]
+    end
+    if left > 0
+      num_string = num_string + "-"
+    end
+  end
+
+  write = left
+  left = 0
+
+  if write > 0
+    num_string = num_string + ones_place[write - 1]
+  end
+
+  num_string
 end
diff --git a/ch10-nothing-new/ninety_nine_bottles_of_beer.rb b/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
index 801de24bd..a63d2d3e6 100644
--- a/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
+++ b/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
@@ -1 +1,14 @@
-# your code here
\ No newline at end of file
+num_at_start = 5
+num_now = num_at_start
+while num_now > 2
+  puts english_number(num_now).capitalize + "bottles of beer on the wall, " +
+       english_number(num_now) + "bottles of beer!"
+  num_now = num_now - 1
+  puts "Take one down, pass it around, " +
+       english_number(num_now) + "bottles of beer on the wall!"
+end
+
+puts "Two bottles of beer on the wall, two bottles of beer!"
+puts "Take one down, pass it around, one bottle of beer on the wall!"
+puts "One bottle of beer on the wall, one bottle of beer!"
+puts "Take one down, pass it around, no more bottles of beer on the wall!"
diff --git a/ch10-nothing-new/sort.rb b/ch10-nothing-new/sort.rb
index 44c6deb58..ed4810003 100644
--- a/ch10-nothing-new/sort.rb
+++ b/ch10-nothing-new/sort.rb
@@ -1,3 +1,24 @@
 def sort arr
-  # your code here
-end
\ No newline at end of file
+    rec_sort arr, []
+end
+
+def rec_sort unsorted, sorted
+    if unsorted.length <= 0
+        return sorted
+    end
+
+    smallest = unsorted.pop
+    still_unsorted = []
+
+    unsorted.each do |tested_object|
+        if tested_object < smallest
+            still_unsorted.push smallest
+            smallest = tested_object
+        else
+            still_unsorted.push tested_object
+        end
+    end
+
+    sorted.push smallest
+    rec_sort still_unsorted, sorted
+end

From 244214d0ce07779922d5656dba99fcc59772b758 Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 19:38:05 +0100
Subject: [PATCH 08/15] Chapter 11.b

---
 .../build_a_better_playlist.rb                | 47 ++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

diff --git a/ch11-reading-and-writing/build_a_better_playlist.rb b/ch11-reading-and-writing/build_a_better_playlist.rb
index 3b31bd241..07d1156a1 100644
--- a/ch11-reading-and-writing/build_a_better_playlist.rb
+++ b/ch11-reading-and-writing/build_a_better_playlist.rb
@@ -1,3 +1,48 @@
 def music_shuffle filenames
-  # your code here
+  filenames = filenames.sort
+  len = filenames.length
+
+  2.times do
+    l_idx = 0
+    r_idx = len / 2
+    shuf = []
+
+    while shuf.length < len
+      if shuf.length % == 0
+        shuf.push(filenames[r_idx])
+        r_idx = r_idx + 1
+      else
+        shuf.push(filenames[r_idx])
+        r_idx = l_idx + 1
+      end
+    end
+
+    filenames = shuf
+  end
+
+  arr = []
+  cut = rand(len)
+  idx = 0
+
+  while idx < len
+    arr.push(filenames[(idx + cut) % len])
+    idx = idx + 1
+  end
+
+  arr
+end
+
+
+
+
+
+
+
+
+
+
+
+
+
+  end
 end

From 34e012b0cdce4c181b915b813dab4c6f611b9b1f Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 19:40:01 +0100
Subject: [PATCH 09/15] Chapter 12.b

---
 .../birthday_helper.rb                        | 24 ++++++++++++++-
 ...party_like_its_roman_to_integer_mcmxcix.rb | 30 +++++++++++++++++--
 2 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/ch12-new-classes-of-objects/birthday_helper.rb b/ch12-new-classes-of-objects/birthday_helper.rb
index 801de24bd..35ef5c6c6 100644
--- a/ch12-new-classes-of-objects/birthday_helper.rb
+++ b/ch12-new-classes-of-objects/birthday_helper.rb
@@ -1 +1,23 @@
-# your code here
\ No newline at end of file
+birth_dates = {}
+File.read("birthdates.txt").each_line do |line|
+  line = line.chomp
+
+  first_comma = 0
+  while line[first_comma] != "," && first_comma < line.length
+    first_comma = first_comma + 1
+  end
+
+  name = line[0..(first_comma - 1)]
+  date = line[-12..-1]
+  birth_dates[name] = name
+end
+
+puts "Whose birthday would you like to know?"
+name = gets.chomp
+date = birth_dates[name]
+
+if date == nil
+  puts "Oooh, I don't know that one..."
+else
+  puts date [0..5]
+end
diff --git a/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb b/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
index 037b6cb09..090c56dc9 100644
--- a/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
+++ b/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
@@ -1,3 +1,29 @@
 def roman_to_integer roman
-  # your code here
-end
\ No newline at end of file
+  digit_vals = {'i' => 1,
+                'v' => 5,
+                'x' => 10,
+                'l' => 50,
+                'c' => 100,
+                'd' => 500,
+                'm' => 1000}
+  total = 0
+  prev = 0
+  index = roman.length - 1
+  while index >= 0
+    c = roman[index].downcase
+    index = index - 1
+    val = digit_vals[c]
+    if !val
+      puts "This is not a valid roman numeral!"
+      return
+    end
+
+    if val < prev
+      val = val * -1
+    else
+      prev = val
+    end
+    total = total + val
+  end
+  total
+end

From a402466aec2adcba140ca402ac7309426b0ae569 Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 20:00:29 +0100
Subject: [PATCH 10/15] Orange Tree corrected

---
 ch13-creating-new-classes/orange_tree.rb | 63 +++++++++++++-----------
 1 file changed, 33 insertions(+), 30 deletions(-)

diff --git a/ch13-creating-new-classes/orange_tree.rb b/ch13-creating-new-classes/orange_tree.rb
index d04f05a1a..7b79267c9 100644
--- a/ch13-creating-new-classes/orange_tree.rb
+++ b/ch13-creating-new-classes/orange_tree.rb
@@ -10,52 +10,55 @@ class OrangeTree
   def initialize
     @height = 0
     @orange_count = 0
-    @alive = true
+    @year = 0
+    @dead = 0
   end
-  def height
-    if @alive
-      @height
+
+  def one_year_passes
+    @height += 0.4
+    @year += 1
+    if @year == 26
+      @dead = 1
+      return "Oh, no! The tree is too old, and has died. :("
+    elsif @dead == 1
+      return "A year later, the tree is still dead. :("
     else
-      "A dead tree is not very tall. :("
+      unless @year < 6
+        oranges = @height * 15 - 25
+        @orange_count = oranges
+      else
+        oranges = 0
+      end
+      return "This year your tree grew to #{@height.round(1)}m tall, and produced #{oranges.to_i} oranges."
     end
   end
-  def count_the_oranges
-    if @alive
-      @orange_count
+
+  def height
+    if @dead == 0
+      return @height.round(1)
     else
-      "A dead tree has no oranges. :("
+      return "A dead tree is not very tall. :("
     end
   end
 
-  def one_year_passes
-    if @alive
-      @height = @height + 0.4
-      @orange_count = 0
-      if @height > 10 && rand(2) > 0
-        @alive = false
-        "Oh no! The tree is too old, and has died! :("
-      elsif @height > 2
-        @orange_count = (@height * 15 - 25).to_i
-        "This year your tree grew to #{@height} m tall," +
-        " and produced #{@orange_count} oranges."
-      else
-        "This year your tree grew to #{@height} m tall," +
-        " but is still too young to bear fruit."
-      end
+  def count_the_oranges
+    if @dead == 0
+      return @orange_count.to_i
     else
-      "A year later, the tree is still dead. :("
+      return "A dead tree has no oranges. :("
     end
   end
+
   def pick_an_orange
-    if @alive
+    if @dead == 0
       if @orange_count > 0
-        @orange_count = @orange_count - 1
-        "You pick a juicy, delicious orange!"
+        return "Mmmmm, delicious juicy freshness."
+        @orange_count -= 1
       else
-        "You search every branch, but find no oranges."
+        return "Oh dear, there are no oranges left.  Try next year!"
       end
     else
-      "A dead tree has nothing to pick. :("
+      return "A dead tree has nothing to pick. :("
     end
   end
 end

From 7c574571fc5f5adfce70cf9da16a36ba865fe76c Mon Sep 17 00:00:00 2001
From: JulioGT <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 21:19:05 +0100
Subject: [PATCH 11/15] Chapter 14

---
 .../better_program_logger.rb                  | 13 ++++++++++---
 .../even_better_profiling.rb                  | 12 ++++++++++--
 ch14-blocks-and-procs/grandfather_clock.rb    | 19 +++++++++++++++++--
 ch14-blocks-and-procs/program_logger.rb       | 17 ++++++++++++++---
 4 files changed, 51 insertions(+), 10 deletions(-)

diff --git a/ch14-blocks-and-procs/better_program_logger.rb b/ch14-blocks-and-procs/better_program_logger.rb
index 0e2e18d57..b9ba9b9e7 100644
--- a/ch14-blocks-and-procs/better_program_logger.rb
+++ b/ch14-blocks-and-procs/better_program_logger.rb
@@ -1,3 +1,10 @@
-def log desc, &block
-  # your code here
-end
\ No newline at end of file
+$nesting_depth = 0
+
+def better_log desc, &block
+  indent = " " * $nesting_depth
+  puts "#{indent}Beginning \"#{desc}\"..."
+  $nesting_depth += 1
+  result = block.call
+  puts "#{indent}...\"#{desc}\" finished, returning: #{result}"
+  $nesting_depth -= 1
+end
diff --git a/ch14-blocks-and-procs/even_better_profiling.rb b/ch14-blocks-and-procs/even_better_profiling.rb
index b01b78fd8..0bb3ff44c 100644
--- a/ch14-blocks-and-procs/even_better_profiling.rb
+++ b/ch14-blocks-and-procs/even_better_profiling.rb
@@ -1,3 +1,11 @@
+$OPT_PROFILING_ON = false
 def profile block_description, &block
-  # your code here
-end
\ No newline at end of file
+  if $OPT_PROFILING_ON
+    start_time = Time.new
+    block[]
+    duration = Time.new - start_time
+    puts "#{block_description}: #{duration} seconds"
+  else
+    block[]
+  end
+end
diff --git a/ch14-blocks-and-procs/grandfather_clock.rb b/ch14-blocks-and-procs/grandfather_clock.rb
index 916f6d354..edb7f9b8b 100644
--- a/ch14-blocks-and-procs/grandfather_clock.rb
+++ b/ch14-blocks-and-procs/grandfather_clock.rb
@@ -1,3 +1,18 @@
 def grandfather_clock &block
-  # your code here
-end
\ No newline at end of file
+  hour = Time.new.hour
+  if hour >= 13
+    hour = hour - 12
+  end
+
+  if hour == 0
+    hour = 12
+  end
+
+  hour.times do
+    block.call
+  end
+end
+
+grandfather_clock do
+  puts "DONG!"
+end
diff --git a/ch14-blocks-and-procs/program_logger.rb b/ch14-blocks-and-procs/program_logger.rb
index 0e2e18d57..62f6f7b2f 100644
--- a/ch14-blocks-and-procs/program_logger.rb
+++ b/ch14-blocks-and-procs/program_logger.rb
@@ -1,3 +1,14 @@
-def log desc, &block
-  # your code here
-end
\ No newline at end of file
+def program_log desc, &block
+  puts "Beginning #{desc.inspect}..."
+  result = block[]
+  puts "...#{desc.inspect} finished, returning: #{result}"
+end
+program_log 'outer block' do
+  program_log 'some little block' do
+    1**1 + 2**2
+  end
+  program_log 'yet another block' do
+    '!doof iahT ekil I'.reverse
+  end
+  '0' == 0
+end

From 6b2b5c6cfd1b1f417b7e8d304b6166f129a08152 Mon Sep 17 00:00:00 2001
From: Julio <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 21:33:56 +0100
Subject: [PATCH 12/15] Update roman_numerals.rb

---
 ch09-writing-your-own-methods/roman_numerals.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ch09-writing-your-own-methods/roman_numerals.rb b/ch09-writing-your-own-methods/roman_numerals.rb
index 5cc8ed29d..0ee765a04 100644
--- a/ch09-writing-your-own-methods/roman_numerals.rb
+++ b/ch09-writing-your-own-methods/roman_numerals.rb
@@ -1,6 +1,7 @@
 def roman_numeral num
     roman = ""
     roman = roman + "M" * (num / 1000)
+    
     if (900..999) === (num % 1000)
         roman = roman + "CM"
         elsif (400..499) === (num  % 500)

From cb51c289b9a9b7b0f633ef10751651123cece165 Mon Sep 17 00:00:00 2001
From: Julio <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 21:55:02 +0100
Subject: [PATCH 13/15] Update roman_numerals.rb

---
 ch09-writing-your-own-methods/roman_numerals.rb | 1 -
 1 file changed, 1 deletion(-)

diff --git a/ch09-writing-your-own-methods/roman_numerals.rb b/ch09-writing-your-own-methods/roman_numerals.rb
index 0ee765a04..5cc8ed29d 100644
--- a/ch09-writing-your-own-methods/roman_numerals.rb
+++ b/ch09-writing-your-own-methods/roman_numerals.rb
@@ -1,7 +1,6 @@
 def roman_numeral num
     roman = ""
     roman = roman + "M" * (num / 1000)
-    
     if (900..999) === (num % 1000)
         roman = roman + "CM"
         elsif (400..499) === (num  % 500)

From e9bb2b53229cb7eec36641ea0176ef76b4b740e6 Mon Sep 17 00:00:00 2001
From: Julio <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 21:57:19 +0100
Subject: [PATCH 14/15] Update old_school_roman_numerals.rb

---
 .../old_school_roman_numerals.rb              | 25 ++++++++-----------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/ch09-writing-your-own-methods/old_school_roman_numerals.rb b/ch09-writing-your-own-methods/old_school_roman_numerals.rb
index 5f8b2c2f3..362380272 100644
--- a/ch09-writing-your-own-methods/old_school_roman_numerals.rb
+++ b/ch09-writing-your-own-methods/old_school_roman_numerals.rb
@@ -1,16 +1,13 @@
 def old_roman_numeral num
-    # your code here
-    roman = ""
-    roman = roman + "M" * (num / 1000)
-    roman = roman + "D" * ((num % 1000) / 500)
-    roman = roman + "C" * ((num % 500) / 100)
-    roman = roman + "L" * ((num % 100) / 50)
-    roman = roman + "X" * ((num % 50) / 10)
-    roman = roman + "V" * ((num % 10) / 5)
-    roman = roman + "I" * ((num % 5) / 1)
-    
-    roman
-    
-end
+  puts "Oops! Try using a positive integer!" if num <= 0
+    roman = ''
+      roman << 'M' * (num / 1000)
+      roman << 'D' * (num % 1000 / 500)
+      roman << 'C' * (num % 500 / 100)
+      roman << 'L' * (num % 100 / 50)
+      roman << 'X' * (num % 50 / 10)
+      roman << 'V' * (num % 10 / 5)
+      roman << 'I' * (num % 5 / 1)
 
-puts(old_roman_numeral(2498))
\ No newline at end of file
+  return roman
+end

From 012ee2d656ed263f38c544a98d072a2c661cbe06 Mon Sep 17 00:00:00 2001
From: Julio <julio.gteran@gmail.com>
Date: Sun, 11 Sep 2016 21:58:23 +0100
Subject: [PATCH 15/15] Update extend_built_in_classes.rb

---
 .../extend_built_in_classes.rb                | 62 +++++++------------
 1 file changed, 22 insertions(+), 40 deletions(-)

diff --git a/ch13-creating-new-classes/extend_built_in_classes.rb b/ch13-creating-new-classes/extend_built_in_classes.rb
index 1be1097c1..293f0de2a 100644
--- a/ch13-creating-new-classes/extend_built_in_classes.rb
+++ b/ch13-creating-new-classes/extend_built_in_classes.rb
@@ -1,45 +1,27 @@
 class Integer
-  def factorial
-    if self <= 1
-      1
-    else
-      self * (self - 1).factorial
-    end
-  end
+  
+def factorial
+
+    raise 'Must not use negative integer' if self < 0
 
-  def roman
-    roman = ""
-    roman = roman + "M" * (self / 1000)
-    roman = roman + "D" * (self % 1000 / 500)
-    roman = roman + "C" * (self % 500 / 100)
-    roman = roman + "L" * (self % 100 / 50)
-    roman = roman + "X" * (self % 50 / 10)
-    roman = roman + "V" * (self % 10 / 5)
-    roman = roman + "D" * (self % 5 / 1)
+    (self <= 1) ? 1 : self * (self-1).factorial
   end
-end
 
-class Array
-  def shuffle
-    arr = self
-    shuffled = []
-    while arr.length > 0
-        rand_index = rand(arr.length)
-
-        curr_index = 0
-        new_array =[]
-
-        arr.each do |item|
-            if curr_index == rand_index
-                shuffled.push item
-                else
-                new_array.push item
-            end
-
-            curr_index = curr_index + 1
-        end
-
-        arr = new_array
-    end
-    shuffled
+
+  def to_roman
+
+    raise 'Must use positive integer' if self <= 0
+
+    roman = ''
+
+    roman << 'M' * (self / 1000)
+    roman << 'D' * (self % 1000 / 500)
+    roman << 'C' * (self % 500 / 100)
+    roman << 'L' * (self % 100 / 50)
+    roman << 'X' * (self % 50 / 10)
+    roman << 'V' * (self % 10 / 5)
+    roman << 'I' * (self % 5 / 1)
+
+    roman
+  end
 end