Run promises in series

OSCC · JavaScript, Function, Promise · Oct 22, 2020

Runs an array of promises in series.

  • Use Array.prototype.reduce() to create a promise chain, where each promise returns the next promise when resolved.
const runPromisesInSeries = ps =>
  ps.reduce((p, next) => p.then(next), Promise.resolve());
const delay = d => new Promise(r => setTimeout(r, d));
runPromisesInSeries([() => delay(1000), () => delay(2000)]);
// Executes each promise sequentially, taking a total of 3 seconds to complete

Recommended snippets & collections

  • JavaScript Promises

    Snippet collection

    JavaScript promises provide a modern and elegant way to to handle asynchronous operations. This snippet collection covers the basics of promises and how to use them in your code.

  • Pipe async functions

    JavaScript, Function

    Performs left-to-right function composition for asynchronous functions.

  • Debounce promise

    JavaScript, Function

    Creates a debounced function that returns a promise.

  • Delay async function execution

    JavaScript, Function

    Delays the execution of an asynchronous function.