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js-set-map-lookups

Convert arrays to Set/Map for repeated membership checks.

@calcomcalcom@calcom
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caldiy
47k95 skills95 agents
Install
$ npx -y skills add calcom/cal.com --agent claude-code

How 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.md
title: 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))
Read it on GitHub ↗
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TypeScript
Language
MIT
License
9d ago
Last commit
5y ago
Created

Repo: calcom/cal.com

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