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Swift vs Objective-C Differences

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Problem

Explain the key differences between Swift and Objective-C. Compare them in terms of syntax, type safety, runtime behavior, interoperability, and when you would choose one over the other in iOS development.

What to Cover

Syntax and readability
Type safety and null handling
Static vs dynamic runtime behavior
Interoperability in mixed codebases
When each language is a practical choice

Comparison Dimensions

AreaWhy It Matters
SyntaxAffects readability and onboarding speed
SafetyReduces runtime bugs and null-related errors
RuntimeDetermines flexibility for reflection and dynamic behavior
InteropImportant for maintaining older iOS codebases