smithery/theorcdev
Use Set and Map for O(1) membership lookups instead of array.includes(). Apply when checking membership repeatedly or performing frequent lookups against a collection.
npx skills add smithery/theorcdev --skill js-set-map-lookups
Other skills from smithery/theorcdev · top by installs.
npx skills add smithery/theorcdev
Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.
Files included with this skill beyond the listing page.
SKILL.md
594 B
SUMMARY.md
193 B
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))