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- Superset of C
- C with features of Smalltalk
- Object oriented
- Created in 1986, almost 10 years before Java
- Passes messages instead of calling methods
- Simpler than C++
- Has no "standard library", unlike C++ and Java
- No namespaces
- Uses label names for method parameters
- Run-time type checking, instead of compile-time (C++, Java)
- Dynamic linking. Code is loaded as needed at run-time.
- Code is comprised of interfaces (header) (.h) and
implementation (methods) (.m)
- Objects are introspective at run-time
- Can add methods to any class without subclassing through categories
- "@" is a compiler directive
- "id" type for all objects
- "nil" type for a null object
- Operations on nil objects do not generate an error
- "NS*" type for "Next Step" objects
- Uses dot syntax for getters/setters
- Has both manual and automatic (2.0) memory management
- Latest version has exception handling
- Typically Objective-C programs have fewer (but larger) classes than other OO languages

Learning Objective-C
C++ and Objective-C Compared
Objective-C is Fun
Objective-C: Guide and Resources

The Objective-C Language
Mac OS X Reference Library Learning Objective-C

Posted: 2010-04-06 14:58:14

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