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pipeAsyncFunctions javascript Code Snippet in 2023

functionpromiseintermediate

Last Updated: 28 January 2023

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

  • Use Array.prototype.reduce() and the spread operator (...) to perform function composition using Promise.prototype.then().
  • The functions can return a combination of normal values, Promises or be async, returning through await.
  • All functions must accept a single argument.
const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Promise.resolve(arg));
const sum = pipeAsyncFunctions( x => x + 1, x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)), x => x + 3, async x => (await x) + 4 ); (async() => { console.log(await sum(5)); // 15 (after one second) })();

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