- Core Foundation Classes
- API Class Libraries
- Automatic Reference Counting (ARC)
- Core Values Classes
- File Management
- Foundation Class Extensibility
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- Deployment
- Distributed Objects
- Documentation
- Logging
- Package Directive
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- Development Environment
- Build
- Compiler
- Debugging
- Profiling
- Software Artifacts
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- Language
- C language Constructs
- Messages
- Naming Constraints and Conventions
- Protocols
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- Pointers and Memory Management
- Memory Allocation
- Memory Deallocation
- Pointer Arithmetic
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- Program Design
- Categories
- Class Level Variables
- Classes
- Object Types
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- Program Flow
- Assertions
- Conditional Operators
- Exceptions
- Loops and Iterators
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- User Interface Windows and Controls
- Application
- Button
- Fields
- Menu
- Window
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