unless_else.rb

# I think we can agree that this code is best, even if contrived:

if @article.public?
  views += 1
else
  redirect_to "/some/other/page"
end

# But sometimes, people don't make query methods that are positive, ie

unless @article.draft?
  redirect_to "/some/other/page"
else
  views +=1
end

# I think that's better than:

if not @article.draft?

# But that's really just taste. In order to not use unless/else, you need to 
# make sure your ? methods are asking a positive question, not a negative one.
# Which is ideal, but none of us are always working on ideal code, right?