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iizukanao/gist:1103592

Created July 25, 2011 05:11
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fibonacci
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gistfile1.coffee
fib = (n) ->
throw new Error "n must be positive integer" if n < 0
switch n
when 0 then 0
when 1 then 1
else
fib(n-1) + fib(n-2)
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