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max-lt/chain.js

Created July 21, 2017 11:48
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Promise chain
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chain.js
/**
* @description exec "fun" with each "arr" element, one after the other
* @template T, S
* @param {Array.<T>} arr
* @param {function(T): S} fun
* @returns Promise.<S>
*/
const promiseChain = (arr, fun) => arr.reduce((p, e) => p.then(() => fun(e)), Promise.resolve());
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