Style-InverseMethods.md

Pattern: Use of !.method inverse

Issue: -

Description

This rule check for usages of not (not or !) called on a method when an inverse of that method can be used instead. Methods that can be inverted by a not (not or !) should be defined in InverseMethods Methods that are inverted by inverting the return of the block that is passed to the method should be defined in InverseBlocks

Examples

# bad
!foo.none?
!foo.any? { |f| f.even? }
!foo.blank?
!(foo == bar)
foo.select { |f| !f.even? }
foo.reject { |f| f != 7 }

# good
foo.none?
foo.blank?
foo.any? { |f| f.even? }
foo != bar
foo == bar
!!('foo' =~ /^\w+$/)

Default configuration

Attribute	Value
InverseMethods	{:any?=>:none?, :even?=>:odd?, :===>:!=, :==>:!, :<=>:>=, :>=>:<=}
InverseBlocks	{:select=>:reject, :select!=>:reject!}

Further Reading

• RuboCop - Style/InverseMethods