How to run promises in sequence in JavaScript

In this Article we will go through how to run promises in sequence only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const run = promises => promises.reduce((p, c) => p.then(rp => c.then(rc => [...rp, rc])), Promise.resolve([]));

Parameters promises is an array of Promise.

run(promises).then((results) => {
    // `results` is an array of promise results in the same order
});