By: Brian Marick in Ruby Tutorials on 2008-10-17
The word "unless" is in the English language for a reason. Contrast "unless the judge is unfair, you'll win" with "if the judge is not unfair, you'll win." Negations - especially negations of already negative ideas can be confusing. The same is true of Ruby code:
winner = you
if not unfair(judge)
winner = you
You can also use unless with the one-line form:
array.pop unless array.empty?
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