exercism ruby track 15-20

Author: kumar91gopi

Diff for: README.md

@@ -214,7 +214,6 @@ solution of many challenges of [HackerRank](https://www.hackerrank.com) and [Cod
 <a name="exercism"/>
 
 ### [Exercism Ruby Track](https://exercism.org/tracks/ruby)
-
 #### Problems
 1. [Hello World](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/hello_world.rb)
 2. [Lasagna](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/lasagna.rb)
@@ -227,11 +226,15 @@ solution of many challenges of [HackerRank](https://www.hackerrank.com) and [Cod
 9. [Chess Game](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/chess_game.rb)
 10. [BlackJack](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/blackjack.rb)
 11. [Bird Count](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/bird_count.rb)
-11. [Boutique Inventory](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/boutique_inventory.rb)
-11. [Boutique Inventory Improvements](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/boutique_inventory_improvements.rb)
-11. [Locomotive Engineer](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/locomotive_engineer.rb)
-11. [Moviegoer](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/moviegoer.rb)
-
+12. [Boutique Inventory](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/boutique_inventory.rb)
+13. [Boutique Inventory Improvements](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/boutique_inventory_improvements.rb)
+14. [Locomotive Engineer](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/locomotive_engineer.rb)
+15. [Moviegoer](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/moviegoer.rb)
+16. [Simple Calculator](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/simple_calculator.rb)
+17. [Two fer](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/two_fer.rb)
+18. [Resistor Color Duo](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/resistor_color_duo.rb)
+19. [Acronym](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/acronym.rb)
+20. [High Scores](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/high_scores.rb)
 
 <a name="leetcode"/>
 

Diff for: exercism/acronym.rb

@@ -0,0 +1,20 @@
+# Problem: https://exercism.org/tracks/ruby/exercises/acronym
+
+#Solution 1
+class Acronym
+    def self.abbreviate(str)
+      words = str.gsub("-"," ").split(" ")
+      abbreviation=""
+      words.each do |x|
+        abbreviation+= x[0]
+      end
+      abbreviation.upcase
+    end
+end 
+
+#Solution 2 (using regex)
+class Acronym
+    def self.abbreviate(string)
+      string.scan(/\b[a-zA-Z]/).join.upcase
+    end
+end

Diff for: exercism/high_scores.rb

@@ -0,0 +1,23 @@
+#Problem :https://exercism.org/tracks/ruby/exercises/high-scores
+
+#Solution
+class HighScores
+    def initialize(scores)
+      @scores=scores
+    end
+    def scores
+      @scores
+    end
+     def latest
+       @scores[-1]
+     end
+    def personal_best
+      @scores.max
+    end
+    def personal_top_three
+      @scores.max(3)
+    end
+    def latest_is_personal_best?
+      @scores.max==@scores[-1]
+    end
+end

Diff for: exercism/resistor_color_dueo.rb

@@ -0,0 +1,35 @@
+# Problem: https://exercism.org/tracks/ruby/exercises/resistor-color-duo
+
+# Solution 1
+class ResistorColorDuo
+    COLORS = %w[
+      black
+      brown
+      red
+      orange
+      yellow
+      green
+      blue
+      violet
+      grey
+      white
+    ].freeze
+    def self.value(colors)
+      colors.first(2).map do |color| 
+        COLORS.index(color)
+      end.join.to_i
+    end
+end
+
+#Solution 2
+class ResistorColorDuo
+  
+    def self.value(colours)
+      colour_codes = {Black: 0,Brown: 1,Red: 2,Orange: 3,Yellow: 4,Green: 5,Blue:6,Violet: 7,Grey: 8,White: 9}
+      band1 =colours[0].to_sym.capitalize
+      band2= colours[1].to_sym.capitalize
+      
+      colour_codes[band2]+(10*colour_codes[band1])
+    end
+end
+      

Diff for: exercism/simple_calculator.rb

@@ -0,0 +1,24 @@
+# Problem : https://exercism.org/tracks/ruby/exercises/simple-calculator
+
+#Solution
+class SimpleCalculator
+    ALLOWED_OPERATIONS = ['+', '/', '*'].freeze
+    UnsupportedOperation=""
+    def self.calculate(first_operand, second_operand, operation)
+      raise ArgumentError unless first_operand.kind_of? (Integer) and second_operand.kind_of?(Integer) 
+      case operation
+      when "+"
+        "#{first_operand} #{operation} #{second_operand} = #{first_operand+second_operand}"
+      when "*"
+        "#{first_operand} #{operation} #{second_operand} = #{first_operand*second_operand}"
+      when "/"
+        begin
+          "#{first_operand} #{operation} #{second_operand} = #{first_operand/second_operand}"
+        rescue ZeroDivisionError
+          "Division by zero is not allowed."
+        end
+      else 
+        raise UnsupportedOperation
+      end
+    end
+end

Diff for: exercism/two_fer.rb

@@ -0,0 +1,8 @@
+# Problem: https://exercism.org/tracks/ruby/exercises/two-fer
+
+# Solution
+class TwoFer
+    def self.two_fer(name="you")
+    "One for #{name}, one for me."
+    end
+end