Water collected between towers: Difference between revisions
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→JS ES6
Alpha bravo (talk | contribs) |
m (→JS ES6) |
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{{Trans|Haskell}}
<lang JavaScript>(() => {
//
// waterCollected :: [Int] -> Int
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//
const main = () => [
[1, 5, 3, 7, 2],
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//
// Tuple (,) :: a -> b -> (a, b)
const Tuple = a =>
b => ({
type:
length: 2
});
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// the predicate p.
xs => [...xs].filter(p);
x[0] > y[0]▼
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xs.reduce((a, x) => {
const v = f(a[0])(x);
return Tuple(v)(a[1].concat(v));
}, Tuple(startValue)([startValue]))[1];
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// scanl1 :: (a -> a -> a) -> [a] -> [a]
const scanl1 = f =>
// scanl1 is a variant of scanl that
// has no starting value argument.
xs => xs.length > 0 ? (
scanl(f)(
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// scanr :: (
const scanr = f =>
startValue => xs => xs.reduceRight(
}, Tuple(startValue)([startValue]))[1];▼
return Tuple(v)([v].concat(a[1]));
// scanr1 :: (a -> a -> a) -> [a] -> [a]
const scanr1 = f =>
// scanr1 is a variant of scanr that has no
// seed-value argument, and assumes that
// xs is not empty.
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// The numeric sum of all values in xs.
xs.reduce((a, x) => a + x, 0);
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// custom function, rather than with the
// default tuple constructor.
xs => ys => xs.map(
0,
// MAIN ---
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