# Data Structure Chooser

> Recommend basic data structures for a task. Use when a junior developer needs help choosing lists, maps, or sets.

- Skill: `lidge-jun/data-structure-chooser` (Agent Skill)
- Install (CLI): `npx skillmds@latest add lidge-jun/data-structure-chooser`
- Raw SKILL.md: https://api.skillmd.com/api/skills/lidge-jun/data-structure-chooser/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: lidge-jun (https://skillmd.com/u/lidge-jun)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/lidge-jun/data-structure-chooser

---


# Data Structure Chooser

## Inputs to request
- Core operations and their frequency.
- Ordering and uniqueness requirements.
- Expected data size and memory limits.

## Workflow
1. Clarify operations: lookup, insert, iterate, order.
2. Recommend a structure with time/space tradeoffs.
3. Provide a small example usage.

## Output
- Recommendation and rationale.

## Quality bar
- State the complexity assumptions clearly.
- Offer an alternative when tradeoffs are close.