01
nil vs NULL vs NSNull in Objective-C: The Difference
Objective-CFundamentalsMemory
nil is a null object pointer, Nil a null class, NULL a null C pointer, and NSNull a placeholder object for collections. Here's when to use each one.
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> Fundamentals
// 5 articles available
- 02
Blocks - Closures Before Swift Existed
Objective-CConcurrencyFundamentalsBefore Swift closures, Objective-C had blocks. The syntax is different, but the power is the same. Here's how to use them effectively.
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The NSObject Class Hierarchy Explained
Objective-CFoundationFundamentalsEvery Objective-C class inherits from NSObject (usually). Here's what NSObject provides and why it matters for every object you create.
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Categories vs Class Extensions in Objective-C
Objective-CFundamentalsBest-PracticesBoth let you add methods to classes, but categories and class extensions serve different purposes. Here's when to use each.
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Message Passing - The Heart of Objective-C
Objective-CRuntimeFundamentalsUnlike C++ virtual methods, Objective-C uses dynamic message passing. Understanding this mechanism unlocks the language's full power.
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