diff --git a/chapters/classes_and_objects/type-function.md b/chapters/classes_and_objects/type-function.md
index 42952ac..96e8cea 100644
--- a/chapters/classes_and_objects/type-function.md
+++ b/chapters/classes_and_objects/type-function.md
@@ -12,16 +12,20 @@ You'd like to know the type of a object without using typeof. (See http://javasc
 Use the following function:
 
 {% highlight coffeescript %}
-type = (obj) ->
-  if obj == undefined or obj == null
-    return String obj
-  classToType = new Object
-  for name in "Boolean Number String Function Array Date RegExp".split(" ")
-    classToType["[object " + name + "]"] = name.toLowerCase()
-  myClass = Object.prototype.toString.call obj
-  if myClass of classToType
-    return classToType[myClass]
-  return "object"
+  type = (obj) ->
+    if obj == undefined or obj == null
+      return String obj
+    classToType = {
+      '[object Boolean]': 'boolean',
+      '[object Number]': 'number',
+      '[object String]': 'string',
+      '[object Function]': 'function',
+      '[object Array]': 'array',
+      '[object Date]': 'date',
+      '[object RegExp]': 'regexp',
+      '[object Object]': 'object'
+    }
+    return classToType[Object.prototype.toString.call(obj)]
 {% endhighlight %}
 
 ## Discussion