Stephanie Friend

lib/event.rb

@@ -0,0 +1,27 @@
+require_relative 'standard_deviation'
+class Event
+
+  attr_reader :name, :ages
+
+  def initialize(name, ages)
+    @name = name
+    @ages = ages
+  end
+
+  def max_age
+    ages.max
+  end
+
+  def min_age
+    ages.min
+  end
+
+  def average_age
+    ages.sum.to_f / ages.length.to_f
+  end
+
+  def standard_deviation_age
+    standard_deviation = StandardDeviation.new(@ages)
+    standard_deviation.calculate_standard_deviation
+  end
+end

lib/print_out.rb

@@ -0,0 +1,38 @@
+class PrintOut
+
+  def initialize
+    @ages = []
+  end
+
+  def enter_year
+    puts "Enter year: "
+    gets.chomp
+  end
+
+  def enter_event_name
+    puts "Enter Event Name: "
+    gets.chomp
+  end
+
+  def initial_enter_age
+    puts "Enter Age of First Participant: "
+    @ages << gets.chomp.to_i
+    additional_enter_ages
+    @ages
+  end
+
+  def additional_enter_ages
+    puts "Do You Have Another Participant? Y for yes, N for no "
+    answer = gets.chomp.upcase
+    if answer == "Y"
+      puts "Enter Age of Next Participant: "
+      @ages << gets.chomp.to_i
+      additional_enter_ages
+    elsif answer == "N"
+      puts "Thank You For Your Input"
+    else
+      puts "Invalid Input, Please Try Again"
+      additional_enter_ages
+    end
+  end
+end

lib/standard_deviation.rb

@@ -1,5 +1,29 @@
-ages = [24, 30, 18, 20, 41]
+class StandardDeviation
 
-# Your code here for calculating the standard deviation
+  def initialize(numbers)
+    @numbers = numbers
+  end
 
-# When you find the standard deviation, print it out
+  def calculate_standard_deviation
+    sum = @numbers.sum
+
+    num = @numbers.length
+
+    divide = sum.to_f / num.to_f
+
+    sub = @numbers.map { |number| number - divide }
+
+    square = sub.map { |s| s ** 2 }
+
+    sum2 = square.sum
+
+    divide2 = sum2 / num
+
+    square = Math.sqrt(divide2).round(2)
+
+    p square
+  end
+end
+
+standard_deviation = StandardDeviation.new([24, 30, 18, 20, 41])
+standard_deviation.calculate_standard_deviation

runner.rb

@@ -0,0 +1,11 @@
+require './lib/games'
+require './lib/event'
+require './lib/print_out'
+
+print_out = PrintOut.new
+
+game = Games.new(print_out.enter_year)
+
+event = Event.new(print_out.enter_event_name, print_out.initial_enter_age)
+game.add_event(event)
+p game.summary

test/event_test.rb

@@ -0,0 +1,44 @@
+require 'minitest/autorun'
+require 'minitest/pride'
+require './lib/games'
+require './lib/event'
+
+class EventTest < Minitest::Test
+
+  def test_it_exists
+    event = Event.new("Curling", [24, 30, 18, 20, 41])
+
+    assert_instance_of Event, event
+  end
+
+  def test_it_has_attributes
+    event = Event.new("Curling", [24, 30, 18, 20, 41])
+
+    assert_equal "Curling", event.name
+    assert_equal [24, 30, 18, 20, 41], event.ages
+  end
+
+  def test_it_can_return_max_age
+    event = Event.new("Curling", [24, 30, 18, 20, 41])
+
+    assert_equal 41, event.max_age
+  end
+
+  def test_it_can_return_min_age
+    event = Event.new("Curling", [24, 30, 18, 20, 41])
+
+    assert_equal 18, event.min_age
+  end
+
+  def test_it_can_return_average_age
+    event = Event.new("Curling", [24, 30, 18, 20, 41])
+
+    assert_equal 26.6, event.average_age
+  end
+
+  def test_it_can_return_standard_deviation_age
+    event = Event.new("Curling", [24, 30, 18, 20, 41])
+
+    assert_equal 8.28, event.standard_deviation_age
+  end
+end