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chainAsync javascript Code Snippet in 2022

functionintermediate

Last Updated: 26 November 2022

Chains asynchronous functions.

  • Loop through an array of functions containing asynchronous events, calling next when each asynchronous event has completed.
const chainAsync = fns => { let curr = 0; const last = fns[fns.length - 1]; const next = () => { const fn = fns[curr++]; fn === last ? fn() : fn(next); }; next(); };
chainAsync([ next => { console.log('0 seconds'); setTimeout(next, 1000); }, next => { console.log('1 second'); setTimeout(next, 1000); }, () => { console.log('2 second'); } ]);

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