/js-set-map-lookups

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.

BOOST

theorcdev@theorcdev

GitHub

From plugin

8bitcn-ui

2k23 skills4 hooks

Install

$ npx -y skills add theorcdev/8bitcn-ui --skill js-set-map-lookups --agent claude-code

How it fires

How this skill gets triggered: by you, by Claude, or both.

Fires itselfAuto-invocation. Claude auto-loads it when your prompt matches the work.
You can call itInvoke it directly when you want it.
Slash command/js-set-map-lookups

Context preview

The summary Claude sees to decide when to auto-load this skill.

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.

SKILL.md

js-set-map-lookups.SKILL.md

name: js-set-map-lookups
description: 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.

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 ↗

Ships with8bitcn-ui

Accessible retro components that you can copy and paste into your apps.Free. Open Source. Built on shadcn/ui. Documentation · Components · Blocks · Themes · Discord

Get the whole plugin

Stats

TypeScript JavaScript React Next.js shadcn/ui

+4 tags

CSS Bash Vercel GitHub

2,042

Stars

116

Forks

Active

Maintenance

TypeScript