🎯

js-set-map-lookups

🎯Skill

from theorcdev/8bitcn-ui

What it does

js-set-map-lookups skill from theorcdev/8bitcn-ui

📦

Part of

theorcdev/8bitcn-ui(23 items)

js-set-map-lookups

Installation

📋 No install commands found in docs. Showing default command. Check GitHub for actual instructions.

Quick InstallInstall with npx

npx skills add theorcdev/8bitcn-ui --skill js-set-map-lookups

Need more details? View full documentation on GitHub →

12Installs

1,576

Last UpdatedJan 22, 2026

View on GitHub Back to Skills

Skill Details

SKILL.md

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):

```typescript

const allowedIds = ['a', 'b', 'c', ...]

items.filter(item => allowedIds.includes(item.id))

```

Correct (O(1) per check):

```typescript

const allowedIds = new Set(['a', 'b', 'c', ...])

items.filter(item => allowedIds.has(item.id))

```

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