What does the !! mean in this Ruby function?

Question

def is_i?
   !!(self =~ /^[-+]?[0-9]+$/)
end

score 5 · Accepted Answer · answered Mar 04 '13 at 03:10

5

It makes sure the response is a boolean. So nil or false wil become false, any other value becomes true

answered Mar 04 '13 at 03:10

zaius

1 Answers1