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js-set-map-lookups
Convert arrays to Set/Map for repeated membership checks.
Install
$ npx -y skills add calcom/cal.diy --agent claude-codeHow it fires
How this agent gets triggered: by you, by Claude, or both.
- Fires itselfAuto-invocation. Claude auto-loads it when your prompt matches the work.Auto-invocation is when the right skill fires by itself at the right moment, driven by a FLOW.md router and a hook, instead of you invoking it by name. It is the difference between a skill being installed and a skill actually getting used.Read the full definition →
- You can call itInvoke it directly when you want it.
Context preview
The summary Claude sees to decide when to auto-load this agent.
Convert arrays to Set/Map for repeated membership checks.
Agent definition
js-set-map-lookups.mdtitle: Use Set/Map for O(1) Lookups impact: LOW-MEDIUM impactDescription: O(n) to O(1) tags: 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))
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TypeScript
Language
MIT
License
1d ago
Last commit
5y ago
Created
Repo: calcom/cal.com
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