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JavaScript ​

ScriptingDynamicGC

The language of the web — runs in every browser and increasingly on servers via Node.js. Flexible and concise in benchmarks, but dynamic typing and implicit coercion give it one of the lowest guardrail scores. Concept distribution is broad, spanning OOP, functional, and async patterns from decades of evolution.

Quality
QualityQuality — Fewer Lines: 24.2Quality — Fewer Concepts: 11Quality — Low Noise: 0.9000000000000004Quality — Safe: 2.3Quality — Lightweight: 0.2Quality — Info per Line: 3.6Fewer LinesFewer ConceptsLow NoiseSafeLightweightInfo per Line
Concept Distribution
Concept DistributionConcept Distribution — Types: 6Concept Distribution — Control: 8Concept Distribution — Functions: 12Concept Distribution — OOP/Data: 10Concept Distribution — Memory: 2Concept Distribution — Concurrency: 10Concept Distribution — Metaprog: 10Concept Distribution — Errors: 7TypesControlFunctionsOOP/DataMemoryConcurrencyMetaprogErrors
Safety2.3 / 5
Memory
Compile-time
GC + no raw pointers prevent memory corruption
Null
None
null/undefined errors crash at runtime, no compile-time checks
Data Races
None
Single-threaded event loop (SharedArrayBuffer risks exist)
Overflow
None
All numbers are floats — precision loss, not overflow
Coercion
None
"5" + 3 → "53", [] + {} → "[object Object]"
Compile-timeRuntimeOpt-inNone
How we score
Expressivenessavg across benchmarks
Lines
15.7
Verbosity
293
Ceremony
0.2
Surface Area65 concepts
46 reserved keywords
Types
6
Control
8
Functions
12
OOP/Data
10
Memory
2
Concurrency
10
Metaprog
10
Errors
7
How we measure
Explicitness
71% explicit29% implicit
71% of 65 concepts have dedicated keyword syntax. The rest are learned through documentation and practice.
AI Readiness
Type Coverage
Dynamic
LLM Tokens
124.3
Tok/Line
7.9
Lower tokens = cheaper API calls. Higher type coverage = more for AI to work with.

Solutions ​

View all JavaScript solutions in the problem pages.