Use Set/Map for O(1) Lookups
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Install skill "js-set-map-lookups" with this command: npx skills add theorcdev/8bitcn-ui/theorcdev-8bitcn-ui-js-set-map-lookups
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))
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