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Objective-C ​

Systems

The original Apple development language — Smalltalk-style messaging grafted onto C. Still found in legacy iOS/macOS codebases but largely replaced by Swift. Inherits C's lack of memory safety (manual retain/release or ARC) and adds its own ceremony with bracket syntax and verbose method names. Low guardrail score reflects the C foundation.

Quality
QualityQuality — Fewer Lines: 25.9Quality — Fewer Concepts: 14Quality — Low Noise: 0.10000000000000053Quality — Safe: 0.8Quality — Lightweight: 0.2Quality — Info per Line: 4.2Fewer LinesFewer ConceptsLow NoiseSafeLightweightInfo per Line
Concept Distribution
Concept DistributionConcept Distribution — Types: 8Concept Distribution — Control: 6Concept Distribution — Functions: 4Concept Distribution — OOP/Data: 10Concept Distribution — Memory: 8Concept Distribution — Concurrency: 4Concept Distribution — Metaprog: 5Concept Distribution — Errors: 3TypesControlFunctionsOOP/DataMemoryConcurrencyMetaprogErrors
Safety0.8 / 5
Memory
Runtime (opt-in)
ARC optional; manual retain/release, C pointer arithmetic
Null
None
nil messaging returns 0 (safe) but masks bugs silently
Data Races
None
No compile-time prevention — same as C
Overflow
None
Inherits C silent wraparound
Coercion
None
Inherits C implicit promotions, id type bypasses checks
Compile-timeRuntimeOpt-inNone
How we score
Expressivenessavg across benchmarks
Lines
14
Verbosity
320
Ceremony
0.2
Surface Area48 concepts
57 reserved keywords
Types
8
Control
6
Functions
4
OOP/Data
10
Memory
8
Concurrency
4
Metaprog
5
Errors
3
How we measure
Explicitness
119% explicit-19% implicit
119% of 48 concepts have dedicated keyword syntax. The rest are learned through documentation and practice.
AI Readiness
Type Coverage
Gradual
LLM Tokens
129
Tok/Line
9.2
Lower tokens = cheaper API calls. Higher type coverage = more for AI to work with.

Solutions ​

View all Objective-C solutions in the problem pages.