# Hidden Side Effects

> State changes a function performs that are not evident from its name or signature, surprising callers.

Record: `lex:hidden-side-effects`
Kind: anti-pattern
Layer: [Structural Core](https://banes-lab.com/records/layer/structural-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lex-hidden-side-effects

## category

- [Core Vocabulary](https://banes-lab.com/records/lex-category/core-vocabulary.md)

## referenced-by

- [Principle of Least Surprise](https://banes-lab.com/records/arch/principle-of-least-surprise.md)
- [Controlled Side Effects](https://banes-lab.com/records/arch/controlled-side-effects.md)