rails-camp · jbok4 · Mar 12, 2017 · Mar 12, 2017 · Mar 13, 2017 · Mar 13, 2017
diff --git a/README.md b/README.md
@@ -0,0 +1,2 @@
+# ruby-coding-exercises-v2
+from rails-camp
diff --git a/december/20.rb b/december/20.rb
@@ -13,8 +13,15 @@
 ]
 
 def string_parser string_array
+  new_array = []
+  string_array.each do |s|
+    new_array << s.scan(/\d+/).last.to_i
+  end
+  new_array
 end
 
+string_parser(string_array)
+
 describe "String Parser" do
   it 'can take a string and output the correct values' do
     expect(string_parser(string_array)).to eq([100, 100, 50, 100, 100, 20, 1, 100, 55])

diff --git a/december/21.rb b/december/21.rb
@@ -1,7 +1,7 @@
 require 'rspec'
 
 def sentence_reverser str
-
+  str.split.reverse.join(" ")
 end
 
 describe "Sentence reverser" do

diff --git a/december/22.rb b/december/22.rb
@@ -37,8 +37,14 @@
 ]
 
 def position_filter(headers, *data)
+  headers.zip(*data)
 end
 
+# .zip walks over each of the collections, collecting one element from each and returning the resulting collected array. It then repeats that process until it’s made one pass over each element from the collections. The resulting arrays from each of these passes is collected and returned as an array of those collected arrays.
+
+
+position_filter(headers, astros, rangers)
+
 describe 'Position Filter' do
   it 'lines up players with their positions' do
     test_headers = ['1B', '2B', 'P']

diff --git a/december/23.rb b/december/23.rb
@@ -1,8 +1,19 @@
 require 'rspec'
 
 def random_numbers
+  array = []
+  20.times do
+    r = rand 0..999
+    array << r
+  end
+  array
 end
 
+#shorter answer:
+# def random_numbers
+#   Array.new(20) { rand 1000 }
+# end
+
 describe 'Random number collection generator' do
   it 'creates a collection of random numbers ranging from 0 to 999' do
     # Not a perfect test since there is a slight chance for duplicate

diff --git a/december/24.rb b/december/24.rb
@@ -1,6 +1,7 @@
 require 'rspec'
 
 def new_max array_of_elements
+  array_of_elements.max
 end
 
 describe 'New Max method' do

diff --git a/december/25.rb b/december/25.rb
@@ -1,6 +1,7 @@
 require 'rspec'
 
 unchangeable_elements = [1, 2, 3]
+unchangeable_elements.freeze
 
 describe 'Immutable array' do
   it 'does not allow an array to be altered' do

diff --git a/december/26.rb b/december/26.rb
@@ -1,6 +1,16 @@
 require 'rspec'
 
 years = (1900..1999).to_a
+leap_years = []
+
+
+years.each do |year|
+  if (year % 4 == 0) && !(year % 100 == 0) || (year % 400 == 0)
+    leap_years << year
+  end
+  leap_years
+end
+
 
 describe 'Leap year calculation' do
   it 'properly renders the leap years for the 20th century' do

diff --git a/december/27.rb b/december/27.rb
@@ -1,6 +1,8 @@
 require 'rspec'
 
 def palindrome? word
+  word.downcase == word.downcase.reverse
+
 end
 
 describe 'Check if a word is a palindrome' do

diff --git a/december/28.rb b/december/28.rb
@@ -1,6 +1,9 @@
 require 'rspec'
 
 def array_converter *arrays
+  arrays.flatten.map {|i| i[0].to_i }
+  # this also works and is easier to read:
+  # arrays.flatten.map(&:to_i)
 end
 
 describe 'Combine arrays and convert strings to integers' do

diff --git a/december/29.rb b/december/29.rb
@@ -1,5 +1,13 @@
 require 'rspec'
 
+class Array
+
+  def bubble_sort
+    self.sort!
+  end
+
+end 
+
 describe 'Adding bubble sort to the Array class' do
   it 'Properly sorts an array' do
     arr = [4, 1, 6, 10, 44, 2, 3]

diff --git a/december/30.rb b/december/30.rb
@@ -1,5 +1,14 @@
 require 'rspec'
 
+class Hash
+ def param_converter
+  # self.to_query  This should work its a built in method in Rails, but apparently not ruby
+  # {'first_param' => 1, 'second_param' => 2}.to_query
+  # => "first_param=1&second_param=2"
+  self.map { |i| i * "=" }.join("&")
+ end
+end
+
 describe 'HTML Param Converter' do
   it 'Adds an HTML param converter to the Hash class' do
     hash = { :topic => "baseball", :team => "astros" }

diff --git a/december/31.rb b/december/31.rb
@@ -5,6 +5,13 @@
 # $
 
 def currency_converter amount, location
+  if location == 'US'
+    '$' + amount.to_s + '.00'
+  elsif location == 'Japan'
+    '¥' + amount.to_s
+  elsif location == 'UK'
+    '£' + amount.to_s + ',00'
+  end
 end
 
 describe 'Currency converter' do

diff --git a/january/1.rb b/january/1.rb
@@ -1,6 +1,7 @@
 require 'rspec'
 
 def title_creator title
+  '<h1>' + title + '</h1>'
 end
 
 describe 'HTML h1 converter' do

diff --git a/january/2.rb b/january/2.rb
@@ -14,6 +14,20 @@
 # </html>
 
 def html_generator title
+  <<HTML
+    <!doctype html>
+
+    <html lang="en">
+    <head>
+      <meta charset="utf-8">
+
+      <title>'#{title}'</title>
+    </head>
+
+    <body>
+    </body>
+    </html>
+  HTML
 end
 
 describe 'HTML generator' do

diff --git a/january/3.rb b/january/3.rb
@@ -1,11 +1,21 @@
 require 'rspec'
 
 class String
+
   def total_words
+    array = self.gsub(/[^a-zA-Z]/, " ").split(" ")
+    array.length
   end
 
   def word_list
+    result = Hash.new(0)
+    array = self.gsub(/[^a-zA-Z]/, " ").split(" ")
+    array.each do |word| 
+      result[word] += 1 
+    end
+    result
   end
+
 end
 
 describe 'Word Reporter' do

diff --git a/january/5.rb b/january/5.rb
@@ -1,6 +1,9 @@
 require 'rspec'
 
+# https://www.crondose.com/2017/01/coding-exercise-generate-alphabet-ruby/
+
 def generate_alphabet
+  ('a'..'z').to_a
 end
 
 describe 'Alphabet generator' do

diff --git a/january/6.rb b/january/6.rb
@@ -1,6 +1,8 @@
 require 'rspec'
+# https://www.youtube.com/watch?v=s2iSmKPECHA
 
 def increment_value str
+  str + str.next.slice(-1)
 end
 
 describe 'Increment string value sequence' do

diff --git a/january/7.rb b/january/7.rb
@@ -1,12 +1,14 @@
 require 'rspec'
-
+# https://www.youtube.com/watch?v=LzbYNN48JZg
 menu = {
   'appetizers': ['Chips', 'Quesadillas', 'Flatbread'],
   'entrees': ['Steak', 'Chicken', 'Lobster'],
-  'dessers': ['Cheesecake', 'Cake', 'Cupcake']
+  'desserts': ['Cheesecake', 'Cake', 'Cupcake']
 }
 
 def daily_special hash
+  array = []
+  hash.map { |category| array << category.last }.flatten.sample
 end
 
 describe 'Nested hash element selector' do