Hashes exercise

_class_exercises/hashes.rb

+# EXERCISE #4
+
+data = {'2010' => 
+  {'Anabelle' => {'output' => 80, 'training' => 24, 'salary' => 8384},
+  'Benedict' => {'output' => 15, 'training' => 34, 'salary' => 7090},
+  'Charlie' => {'output' => 81, 'training' => 82, 'salary' => 3482},
+  'Dorothy' => {'output' => 63, 'training' => 8, 'salary' => 6057}
+  },
+  '2011' => 
+  {'Anabelle' => {'output' => 67, 'training' => 68, 'salary' => 6858},
+  'Benedict' => {'output' => 9, 'training' => 49, 'salary' => 9505},
+  'Charlie' => {'output' => 48, 'training' => 48, 'salary' => 9987},
+  'Dorothy' => {'output' => 25, 'training' => 28, 'salary' => 5002}
+  },
+  '2012' => 
+  {'Anabelle' => {'output' => 33, 'training' => 24, 'salary' => 3580},
+  'Benedict' => {'output' => 27, 'training' => 54, 'salary' => 2191},
+  'Charlie' => {'output' => 11, 'training' => 10, 'salary' => 6340},
+  'Dorothy' => {'output' => 93, 'training' => 99, 'salary' => 5454}
+  },
+  '2013' => 
+  {'Anabelle' => {'output' => 31, 'training' => 81, 'salary' => 1450},
+  'Benedict' => {'output' => 5, 'training' => 42, 'salary' => 5791},
+  'Charlie' => {'output' => 35, 'training' => 15, 'salary' => 415},
+  'Dorothy' => {'output' => 52, 'training' => 98, 'salary' => 2366}
+  },
+  '2014' => 
+  {'Anabelle' => {'output' => 54, 'training' => 32, 'salary' => 9086},
+  'Benedict' => {'output' => 8, 'training' => 32, 'salary' => 1750},
+  'Charlie' => {'output' => 16, 'training' => 74, 'salary' => 9400},
+  'Dorothy' => {'output' => 19, 'training' => 52, 'salary' => 7050}
+  },
+  '2015' =>
+  {'Anabelle' => {'output' => 4, 'training' => 37, 'salary' => 3054},
+  'Benedict' => {'output' => 81, 'training' => 83, 'salary' => 2808},
+  'Charlie' => {'output' => 33, 'training' => 36, 'salary' => 5547},
+  'Dorothy' => {'output' => 53, 'training' => 42, 'salary' => 3677}
+  }
+
+}
+
+def get_average_salary_per_employee(data)
+  result = Hash.new
+  
+  years = 0
+  data.each do |key, yeardata|
+    yeardata.each do |employee, empdata|
+      sum = result[employee]
+      if sum.nil?
+        sum = 0
+      end
+      sum += empdata['salary']
+      result[employee] = sum
+    end
+    years += 1
+  end
+  
+  result.each do |employee, salarydata|
+    result[employee] /= years
+  end
+  
+  return result
+end
+
+puts "Average Salary Per Employee: " + get_average_salary_per_employee(data).to_s