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aris/.claude/skills/vercel-react-best-practices/rules/js-set-map-lookups.md
kenneth 331a2596fa Add Claude skills for React best practices and web design 
- react-best-practices: Performance optimization patterns (client-side only)
- web-design-guidelines: UI review against Web Interface Guidelines

Co-authored-by: Ona <no-reply@ona.com>
2026-01-17 11:53:08 +00:00

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title, impact, impactDescription, tags
title impact impactDescription tags
Use Set/Map for O(1) Lookups LOW-MEDIUM O(n) to O(1) javascript, set, map, data-structures, performance

Use Set/Map for O(1) Lookups

Convert arrays to Set/Map for repeated membership checks.

Incorrect (O(n) per check):

const allowedIds = ['a', 'b', 'c', ...]
items.filter(item => allowedIds.includes(item.id))

Correct (O(1) per check):

const allowedIds = new Set(['a', 'b', 'c', ...])
items.filter(item => allowedIds.has(item.id))