Javascript #33 Objects Properties Basics to Advanced

JavaScript Properties
Properties are the values associated with a JavaScript object.
A JavaScript object is a collection of unordered properties.
Properties can usually be changed, added, and deleted, but some are read only.

Property Attributes
All properties have a name. In addition they also have a value.
The value is one of the property's attributes.
Other attributes are: enumerable, configurable, and writable.
These attributes define how the property can be accessed (is it readable?, is it writable?)
In JavaScript, all attributes can be read, but only the value attribute can be changed (and only if the property is writable).
( ECMAScript 5 has methods for both getting and setting all property attributes)