Data update

Task/Add-a-variable-to-a-class-instance-at-runtime/Crystal/add-a-variable-to-a-class-instance-at-runtime.cr

@@ -0,0 +1,25 @@
+class SuperDynamic
+  @vars = {} of String => String | Int32
+
+  def set_vars (@vars)
+  end
+
+  macro method_missing (call)
+    {% name = call.name %}
+    {% if name.ends_with? "=" %}
+      {% name = name.gsub(/=$/, "") %}
+      raise "unknown var" unless @vars.has_key? {{name.id.stringify}}
+      @vars[{{name.id.stringify}}] = {{call.args[0].id}}
+    {% else %}
+      @vars[{{name.id.stringify}}]
+    {% end %}
+  end
+end
+
+sd = SuperDynamic.new
+
+sd.set_vars({ "a" => 1, "b" => "2" })
+
+p! sd.a
+sd.a = 99
+p! sd.a