Created
September 21, 2012 14:07
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Erlang fizzbuzz
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-module(fizzbuzz). | |
-export([fizzbuzz/1]). | |
-define(MOD_THREE, "fizz"). | |
-define(MOD_FIVE, "buzz"). | |
% Helper function to map fizzbuzz across a sequence of numbers | |
fizzbuzz(To) -> | |
lists:map(fun nt/1, lists:seq(1, To)). | |
% initiate the number transform for a Number | |
nt(Number) -> | |
number_transform(Number, []). | |
% transform the number to either nothing or 'fizz' or 'buzz' or 'fizzbuzz' | |
%% NOTE: This style of fizzbuzz allows arbitrary matching | |
%% e.g. add bazz for number where Number rem 7 == 0 | |
number_transform(0, Words) -> | |
lists:flatten(lists:reverse(Words)); | |
number_transform(Number, Words) when Number rem 3 == 0 -> | |
case lists:member(?MOD_THREE, Words) of | |
true -> number_transform(round(Number / 3), Words); | |
false -> number_transform(round(Number / 3), [?MOD_THREE|Words]) | |
end; | |
number_transform(Number, Words) when Number rem 5 == 0 -> | |
case lists:member(?MOD_FIVE, Words) of | |
true -> number_transform(round(Number / 5), Words); | |
false -> number_transform(round(Number / 5), [?MOD_FIVE|Words]) | |
end; | |
number_transform(Number, []) -> | |
Number; | |
number_transform(Number, Words) -> | |
Number, | |
lists:flatten(lists:reverse(Words)). |
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I can almost read that! Almost.
Oh, erlang. I want to love you, but your syntax gives me nightmares.