---
title: "modifies-parameter"
description: "Detect parameter mutation."
image: "https://strider.gempir.com/og.png"
---

> Documentation Index
> Fetch the complete documentation index at: https://strider.gempir.com/llms.txt
> Use this file to discover all available pages before exploring further.

# modifies-parameter

<!-- Code generated by docs/scripts/generate-check-docs.go; DO NOT EDIT. -->

**Default severity:** `error`

Detect parameter mutation.

## Bad

```go
func normalize(value string) string { value = strings.TrimSpace(value); return value }
```

## Good

```go
func normalize(value string) string { normalized := strings.TrimSpace(value); return normalized }
```

Source: https://strider.gempir.com/lints/modifies-parameter/index.mdx