codemix/fast.js

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

3382 stars · 111 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

fast.js is a JavaScript library providing faster user-land reimplementations of common native built-in functions like forEach, map, and reduce, optimized for the V8 engine. It achieves speedups by skipping rarely-used ECMAScript edge cases such as sparse array handling.

Use cases

• speed up array iteration in node.js
• replace slow native forEach and map calls
• optimize hot loops in JavaScript code
• benchmark native methods against JS reimplementations
• clone objects and arrays faster

When to choose

• you run on V8 (node.js or chrome) and need maximum iteration performance
• your code has no sparse arrays and doesn't need full spec compliance
• you're profiling a hot path where native methods are a bottleneck

When to avoid

• you need 100% ECMAScript spec compliance or a drop-in replacement
• you target non-V8 JavaScript engines or browsers
• you want an actively maintained library - the last release was 2019

Facets

library · maturity abandoned

benchmarking developer-tools performance developer-tools web-development micro-optimization array-methods v8 utility-library nodejs javascript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="codemix/fast.js")