# #126 [Solution] The varieties of FizzBuzz experience

Here are ten different solutions:

class Integer

# This quiz was simple enough that I decided to come up with as many

different ways to

# do it some simple, some rather bizzare and cryptic.

#This one simply follows the spec pretty slavishly.
def fizz_buzz1
case
when self % 15 == 0
“FizzBuzz”
when self % 3 == 0
“Fizz”
when self % 5 == 0
“Buzz”
else
self.to_s
end
end

# Nest the fizzbuzz test

def fizz_buzz2
case
when self % 3 == 0
self % 5 == 0 ? “FizzBuzz” : “Fizz”
when self % 5 == 0
“Buzz”
else
self.to_s
end
end

# 3. nil.to_s returns the empty string.

def fizz_buzz3
case
when self % 3 == 0
“Fizz#{[“Buzz”][self % 5]}”
when self % 5 == 0
“Buzz”
else
self.to_s
end
end

# Use a mod 15 approach

def fizz_buzz4
([:FizzBuzz, nil, nil, :Fizz, nil, :Buzz, :Fizz, nil, nil, :Fizz,
:Buzz, nil, :Fizz][self % 15]||self).to_s
end

# Then a series of subs are used to evolve the string to the correct

def fizz_buzz5
(“%2d,%s” % [self,
to_s(15)]).sub(/.+?[369c]\$/,‘Fizz’).sub(/.+?[0]\$/,‘FizzBuzz’).sub(/.+?[5a]\$/,“Buzz”).sub(/^\s?(\d+),.*\$/,‘\1’)
end

# And I HATE cryptic code.

def fizz_buzz6
(“%2d,%s” % [self, to_s(15)]).sub(/.+?((0|([5a]))|[369c])\$/) {
“#{\$3 ? ‘’ : ‘Fizz’}#{\$2 ? ‘Buzz’ : ‘’}”
}.sub(/^\s?(\d+),.*\$/,‘\1’)
end

# Here’s another one-line method approach

def fizz_buzz7
(self % 15 == 0) ? “FizzBuzz” : ((self % 3 == 0) ? “Fizz” : ((self
% 5 == 0) ? “Buzz” : to_s))
end

# And one more

def fizz_buzz8
“#{“Fizz” if self % 3 == 0}#{“Buzz” if self % 5 == 0}#{[nil,
self][1+((self % 3)*(self % 5))]}”
end
end

# This is arranged in rows of 15 showing the mod 15 pattern.

expected = %w{1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14
FizzBuzz
16 17 Fizz 19 Buzz Fizz 22 23 Fizz Buzz 26 Fizz 28 29
FizzBuzz
31 32 Fizz 34 Buzz Fizz 37 38 Fizz Buzz 41 Fizz 43 44 FizzBuzz
46 47 Fizz 49 Buzz Fizz 52 53 Fizz Buzz 56 Fizz 58 59 FizzBuzz
61 62 Fizz 64 Buzz Fizz 67 68 Fizz Buzz 71 Fizz 73 74 FizzBuzz
76 77 Fizz 79 Buzz Fizz 82 83 Fizz Buzz 86 Fizz 88 89 FizzBuzz
91 92 Fizz 94 Buzz Fizz 97 98 Fizz Buzz
}

# test em all, these should all print true. Yeah, I know these should

be test::unit testcases.
p (1…100).map {|i| i.fizz_buzz1} == expected
p (1…100).map {|i| i.fizz_buzz2} == expected
p (1…100).map {|i| i.fizz_buzz3} == expected
p (1…100).map {|i| i.fizz_buzz4} == expected
p (1…100).map {|i| i.fizz_buzz5} == expected
p (1…100).map {|i| i.fizz_buzz6} == expected
p (1…100).map {|i| i.fizz_buzz7} == expected
p (1…100).map {|i| i.fizz_buzz8} == expected

# and now two one liners

p (1…100).map {|i| (i % 15 == 0) ? “FizzBuzz” : ((i % 3 == 0) ?
“Fizz” : ((i % 5 == 0) ? “Buzz” : i.to_s))} == expected
p (1…100).map {|i| “#{“Fizz” if i % 3 == 0}#{“Buzz” if i % 5 ==
0}#{[nil, i][1+((i % 3)*(i % 5))]}”} == expected

# Now lets use one of these to actually print

(1…100).each {|i| p i.fizz_buzz1}

Rick DeNatale

My blog on Ruby