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munkhorgil/composeAsync.js

Created October 3, 2019 08:28
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Compose async functions right to left
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composeAsync.js
/**
* Compose async functions
* @param {Functions} fns
* @returns {Promise} fns value
*/
const compose = (...fns) => arg => fns.reduceRight((p, f) => p.then(f), Promise.resolve(arg));
const foo = a => a + 1;
const bar = b => b + 1;
const result = compose(foo, bar)(1);
console.log(result) // 3
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