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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Anonymous-recursion/Python/anonymous-recursion-5.py Normal file
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>>> Y = lambda f: lambda n: f(f,n)
>>> fib = lambda f, n: None if n < 0 else (0 if n == 0 else (1 if n == 1 else f(f,n-1) + f(f,n-2))) #same as the first three implementations
>>> [ Y(fib)(i) for i in range(-2, 10) ]
[None, None, 0, 1, 1, 2, 3, 5, 8, 13, 21, 34]