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obj-j bits

Gotcha bits, taken from obj-j tutorial.

• Objective-J has two types of objects, native JavaScript objects and Objective-J objects
• The beginning of a class is always the keyword @implementation, followed by the class name
• Each method signature starts with either a dash (-) or a plus (+)
• Dashes are used for instance methods
• One pattern you'll find in Objective-J and Cappuccino is the idea of passing a method as an argument to another method
• The alloc class method is analogous to the "new" keyword in many languages
• The init instance methods are like the constructors in those languages, in that they perform initialization on the newly created instance
• Some classes specify their own custom init method
• "self" is the Objective-J equivalent to JavaScript's "this"
• There are two types of import statements. The angle brackets indicate framework code, while the quotation marks indicate local project code
• JavaScript is garbage collected, and so is Objective-J, so you won't see any calls to retain or release in Objective-J code as you would in Objective-C
• Categories allow you to add methods to a class without needing to create a new subclass or modify the class's source code
• The syntax for the category is @implementation, followed by the class you're adding to, followed by the name of your category in parentheses
• Technique called toll-free bridging which allows any JavaScript object like an array or a string to act both as a JavaScript object and a Cappuccino object at the same time
• Variables not specifically declared with var become globals

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