OOD

Author: kristinadd

Composition/Bicycle.rb

@@ -0,0 +1,12 @@
+class Bicycle # Bicycle is composed of parts
+  attr_reader :size, :parts
+
+  def initialize(size:, parts:)
+    @size = size
+    @parts = parts
+  end
+
+  def spares
+    parts.spares
+  end
+end

Composition/MountainBikeParts.rb

@@ -0,0 +1,21 @@
+require_relative 'Parts'
+
+class MountainBikeParts<Parts
+  attr_reader :front_shock, :rear_shock
+
+  def post_initialize(**opts)
+    @front_shock = opts[:front_shock]
+    @rear_shock = opts[:rear_shock]
+  end
+
+  def local_spares
+    {
+      front_shock: front_shock
+    }
+  end
+
+  def default_tire_size
+    "2.1"
+  end
+end
+

Composition/Parts.rb

@@ -0,0 +1,31 @@
+class Parts # Abstract class
+  attr_reader :chain, :tire_size
+
+  def initialize(**opts)
+    @chain = opts[:chain] || default_chain
+    @tire_size = opts[:tire_size] || default_tire_size
+
+    post_initialize(**opts)
+  end
+
+  def spares
+    { chain: chain,
+      tire_size: tire_size}.merge(local_spares)
+  end
+
+  def default_tire_size
+    raise NotImplementedError
+  end
+
+  def post_initialize(**opts)
+    # hook
+  end
+  
+  def default_chain
+    "11-Speed"
+  end
+
+  def local_spares
+    {}
+  end
+end

Composition/RoadBikeParts.rb

@@ -0,0 +1,20 @@
+require_relative 'Parts'
+
+class RoadBikeParts<Parts
+  attr_reader :tape_color # getter method
+
+  def post_initialize(**opts)
+    @tape_color = opts[:tape_color]
+  end
+
+  def local_spares
+    {
+      tape_color: tape_color
+    }
+  end
+
+  def default_tire_size
+    "23"
+  end
+end
+

Composition/Test.rb

@@ -0,0 +1,17 @@
+require_relative 'Bicycle'
+require_relative 'Parts'
+require_relative 'RoadBikeParts'
+require_relative 'MountainBikeParts'
+
+class Test
+  road_bike = Bicycle.new(
+    size: "L", 
+    parts: RoadBikeParts.new(tape_color: "pink")
+  )
+
+  puts road_bike.size
+  puts road_bike.parts.tape_color
+
+  
+end
+