Created
November 11, 2013 15:25
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Fibonacci via fast doubling
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| # Fibonacci via fast doubling | |
| fibo = (n) -> | |
| if n is 0 | |
| [0, 1] | |
| else | |
| [a, b] = fibo ~~(n / 2) | |
| c = a * (2 * b - a) | |
| d = b * b + a * a | |
| if n % 2 is 0 then [c, d] else [d, c + d] |
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