add instance variable spec

spec/basic/step01_variable_spec.rb

@@ -12,10 +12,10 @@
     # Same as the previous method question. (前のメソッドの質問と同じ)
     it 'variable initial' do
       sea = 'mystic'
-      land = 8.to_s
-      piari = nil.to_s
+      land = 8
+      piari = nil
       dstore = 'mal'
-      sea = sea + land + piari + ':' + dstore
+      sea = "#{sea}#{land}#{piari}:#{dstore}"
       log(sea) # your answer? =>
     end
 
@@ -37,4 +37,33 @@
       log(sea) # your answer? =>
     end
   end
+
+  context 'instance variable' do
+    class TestClass
+      attr_accessor :broadway, :dockside, :hangar, :magiclamp
+    end
+
+    # Same as the previous method question. (前のメソッドの質問と同じ)
+    it 'variable instance variable default value' do
+      sea = TestClass.new.broadway
+      log(sea) # your answer? =>
+    end
+
+    # Same as the previous method question. (前のメソッドの質問と同じ)
+    it 'variable instance variable via method' do
+      instance = TestClass.new
+      instance.broadway = 'bbb'
+      instance.magiclamp = 'magician'
+      instance.dockside = 0
+      help_instance_variable_via_method(instance, instance.magiclamp)
+      sea = "#{instance.broadway}|#{instance.dockside}|#{instance.hangar}|#{instance.magiclamp}"
+      log(sea) # your answer? =>
+    end
+
+    def help_instance_variable_via_method(instance, magiclamp)
+      instance.broadway = 'bigband'
+      instance.dockside += 1
+      magiclamp = 'burn'
+    end
+  end
 end