Predicate methods should end in a question mark #133
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Follow Ruby standards when returning a boolean value. This means the names of predicate methods (methods that return a boolean value) should end in a question mark. (i.e. Array#empty?).
Per:
https://github.com/styleguide/ruby
http://pragmati.st/2012/03/24/the-elements-of-ruby-style-predicate-methods/
http://raganwald.com/2013/09/12/the-predicate-module-pattern.html