---
title: "Inefficient keySet Iterator"
description: "Check for inefficient uses of iterators that iterate on keys then lookup their values, instead of iterating on key-value pairs directly."
---

Check for inefficient uses of iterators that iterate on keys then lookup their values, instead of iterating on key-value pairs directly.

Activate with `--inefficient-keyset-iterator`.

Supported languages:
- C/C++/ObjC: No
- Java: Yes