Pascal's triangle: Difference between revisions
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m (→Functional Python: Pruned out three unused primitives) |
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<lang python>from itertools import (accumulate, chain, islice, starmap) |
<lang python>from itertools import (accumulate, chain, islice, starmap) |
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from operator import (add) |
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# pascal :: [Int] -> [Int] |
# pascal :: [Int] -> [Int] |
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def pascal(xs): |
def pascal(xs): |
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return zipWith( |
return zipWith(add)([0] + xs)(xs + [0]) |
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return (q * c) + s + ((q + qr[1]) * c) |
return (q * c) + s + ((q + qr[1]) * c) |
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return lambda c: lambda s: go(c, s) |
return lambda c: lambda s: go(c, s) |
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# compose (<<<) :: (b -> c) -> (a -> b) -> a -> c |
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def compose(g): |
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return lambda f: lambda x: g(f(x)) |
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# const :: a -> b -> a |
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def const(k, _): |
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return k |
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v = f(v) |
v = f(v) |
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return lambda x: go(x) |
return lambda x: go(x) |
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# plus :: Num -> Num -> Num |
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def plus(a, b): |
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return a + b |
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