End the NotNot

first_example.rb

def fizzy?(string)
  string.match(/fizz/)
end

p fizzy?("foobar")   # => nil
p fizzy?("fizzbuzz") # => #<MatchData "fizz">

second_example.rb

def fizzy?(string)
  !!string.match(/fizz/)
end

p fizzy?("foobar")   # => false
p fizzy?("fizzbuzz") # => true

third_example.rb

def fizzy?(string)
  true & string.match(/fizz/)
end

p fizzy?("foobar")   # => false
p fizzy?("fizzbuzz") # => true