JavaScript · 2026-10-28

Deduplicating items by id

Would you approve this?

JavaScript

Loading editor…

Use EraCode. Less ErrorCode.

Product

Home
Features
Daily challenges
codebase-coffee
Pricing

Guides

Topics
Practice
Glossary
codebase-coffee + EraCode
Prevent skill atrophy
Stay sharp with AI coding
Daily coding practice

Teams

Senior developers
Engineering team training

Legal

Privacy
Contact

Follow EraCode