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unnecessary_underscores

Contents
Lint rule

Unnecessary use of multiple underscores.

Description

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The analyzer produces this diagnostic when an unused variable is named with multiple underscores (for example __). A single _ wildcard variable can be used instead.

Example

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The following code produces this diagnostic because the __ parameter is unused:

dart
void function(int __) { }

Common fixes

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Replace the name with a single underscore:

dart
void function(int _) { }

Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.