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cristobal/reduce-promises-over-x.js

Created September 1, 2016 11:42
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Reduce a set of promises (S) over a a value x
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reduce-promises-over-x.js
const reducePromises = (S, x) =>
S.reduce((f, g) => f.then(g), Promise.resolve(x));
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Example code:

const square = x => x * x
const negate = x => -x

reducePromises(3, [square, negate])
  .then(v => console.log(v)) // -9

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