add some exercises

exercises/done/gecko_03.rb

@@ -0,0 +1,102 @@
+#!/usr/bin/env ruby
+
+class Gecko
+  attr_reader :name
+
+  def initialize(name)
+    @name = name
+    @meals = []
+  end
+
+  def eat(prey, quantity, calcium)
+    return false unless prey.is_a?(String)
+
+    prey = prey.strip
+
+    return false if prey.empty?
+    return false unless quantity.is_a?(Integer) && quantity.positive?
+    return false unless calcium == true || calcium == false
+
+    @meals << [prey, quantity, calcium]
+    true
+  end
+
+  def display_meals
+    puts "#{@name} a mangé :"
+
+    @meals.each do |prey, quantity, calcium|
+      suffix = calcium ? " (calcium)" : ""
+      puts "- #{quantity} #{prey}#{suffix}"
+    end
+
+    puts
+    puts "Total : #{total_prey} proies"
+  end
+
+  def display_last_meal
+    puts
+
+    if @meals.empty?
+      puts "Aucun repas enregistré."
+      return
+    end
+
+    puts "Dernier repas :"
+
+    prey, quantity, calcium = @meals.last
+    suffix = calcium ? " (calcium)" : ""
+    puts "- #{quantity} #{prey}#{suffix}"
+  end
+
+  def meal_count
+    @meals.length
+  end
+
+  def total_prey
+    total = 0
+
+    @meals.each do |_prey, quantity, _calcium|
+      total += quantity
+    end
+
+    total
+  end
+
+  def ate?(searched_prey)
+    @meals.any? do |prey, _quantity, _calcium|
+      prey == searched_prey
+    end
+  end
+
+  def calcium_meal_count
+    @meals.count do |_prey, _quantity, calcium|
+      calcium
+    end
+  end
+end
+
+delta = Gecko.new("Delta")
+
+delta.eat("dubia", 2, true)
+delta.eat("ver de farine", 3, false)
+delta.eat("cloporte", 1, true)
+
+delta.display_meals
+delta.display_last_meal
+
+puts
+puts "Delta a fait #{delta.meal_count} repas."
+puts "Delta a mangé #{delta.total_prey} proies."
+
+puts
+puts delta.ate?("dubia")
+
+puts
+puts delta.calcium_meal_count
+
+puts
+puts delta.name
+
+puts
+puts delta.eat("dubia", -2, true) # false
+puts delta.eat("dubia", 2, true)  # true