Lint-UnusedMethodArgument.md

Pattern: Unused method argument

Issue: -

Description

Use _ to prefix unused block parameters and local variables. It's also acceptable to use just _ (although it's a bit less descriptive). This convention is recognized by the Ruby interpreter and tools like RuboCop and will suppress their unused variable warnings.

Examples

# bad

def some_method(used, unused, _unused_but_allowed)
  puts used
end

# good

def some_method(used, _unused, _unused_but_allowed)
  puts used
end

Default configuration

Attribute	Value
AllowUnusedKeywordArguments	false
IgnoreEmptyMethods	true

Further Reading

• RuboCop - Lint/UnusedMethodArgument
• https://github.com/bbatsov/ruby-style-guide#underscore-unused-vars