Objective

Blocks in Objective-C

Learn how Objective-C blocks capture surrounding variables as closures, how __block and __weak change capture behavior, and how to avoid retain cycles.

Classes and Objects in Objective-C

How Objective-C classes are declared with @interface/@implementation, and how objects are created via alloc and init.

Conditionals in Objective-C

Learn how Objective-C branches program flow using if/else, the ternary operator, and switch statements, and how BOOL and nil interact with truthiness.

Inheritance in Objective-C

How Objective-C's single-inheritance class hierarchy works, including method overriding, calling super, and designated initializers.

Loops in Objective-C

Understand Objective-C's for, while, do-while, and fast enumeration (for-in) loops, and how break and continue control iteration.

Objective-C and Swift Interoperability

How Objective-C and Swift code coexist in the same Xcode target, and the annotations and conventions that make the bridge between them safe and idiomatic.

Objective-C Best Practices

Practical, battle-tested conventions for writing safe, readable, and maintainable Objective-C code, from memory management to naming and API design.

Objective-C Data Types

Objective-C's primitive types, Foundation typedefs like BOOL and NSInteger, and object types accessed through pointers.

Objective-C Interview Questions

Commonly asked Objective-C interview questions covering memory management, runtime behavior, protocols, and blocks, with explanations of what strong answers co…

Objective-C Quick Reference

A condensed reference for Objective-C syntax, common Foundation types, memory attributes, and idioms you'll reach for constantly while coding.

Objective-C Runtime and Dynamism

How Objective-C's message-passing runtime enables introspection, method swizzling, and associated objects, and the risks that come with that power.

Objective-C Syntax and Variables

How Objective-C extends C syntax with object messaging, and how primitive versus object variables are declared.

Objective-C vs Swift

A practical comparison of Objective-C and Swift covering syntax, memory management, interoperability, and when each language is the right choice on Apple platf…

Unit Testing Objective-C Code

How XCTest structures test cases and assertions, how to isolate dependencies with mocks, and how to test asynchronous Objective-C code reliably.

What Is Objective-C?

A history and overview of Objective-C, the C-based, Smalltalk-inspired language that powered Apple's platforms for decades.

Your First Objective-C Program

Writing, compiling, and running a first Objective-C 'Hello, World!' program from the terminal.