diff --git a/page/javascript-101/objects.md b/page/javascript-101/objects.md
index a619920d..1443fd18 100644
--- a/page/javascript-101/objects.md
+++ b/page/javascript-101/objects.md
@@ -7,6 +7,14 @@ attribution:
 ---
 Objects contain one or more key-value pairs. The key portion can be any string. The value portion can be any type of value: a number, a string, an array, a function, or even another object.  When one of these values is a function, it’s called a method of the object. Otherwise, they are called properties.
 
+In comparison to other programming languages objects in JavaScript are similar to:
+
+* Dictionaries in Python.
+* Hashes in Perl and Ruby.
+* Hash tables in C and C++.
+* HashMaps in Java.
+* Associative arrays in PHP.
+
 As it turns out, nearly everything in JavaScript is an object — arrays, functions, numbers, even strings — and they all have properties and methods.
 
 ```
@@ -28,8 +36,28 @@ When creating object literals, note that the key portion of each key-value pair
 ```
 // test
 var myObject = {
-  validIdentifier: 123,
-  "some string": 456,
-  99999: 789
+	validIdentifier: 123,
+	"some string": 456,
+	99999: 789
 };
 ```
+
+## Iterating Over the Enumerable Properties of an Object:
+
+```
+var myObject = {
+	validIdentifier: 123,
+	"some string": 456,
+	99999: 789
+};
+
+for ( var prop in myObject ) { 
+  console.log( "Property : " + prop + " ; value : " + myObject[ prop ] ); 
+}
+
+// Would log :
+// Property : 99999 ; value : 789
+// Property : validIdentifier ; value : 123
+// Property : some string ; value : 456
+
+```
diff --git a/page/javascript-101/testing-type.md b/page/javascript-101/testing-type.md
index 088fa6a9..de67f679 100644
--- a/page/javascript-101/testing-type.md
+++ b/page/javascript-101/testing-type.md
@@ -28,6 +28,8 @@ typeof myArray;    // "object" -- Careful!
 typeof myString;   // "string"
 typeof myNumber;   // "number"
 typeof null;       // "object" -- Careful!
+typeof undefined;  // "undefined" -- Careful!
+
 
 if ( myArray.push && myArray.slice && myArray.join ) {