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a-sync-waterfall

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a-sync-waterfall

Runs a list of async tasks, passing the results of each into the next one

  • 1.0.1
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What is a-sync-waterfall?

The a-sync-waterfall npm package is used to run an array of asynchronous functions in series, each passing their results to the next in the array. However, if any of the functions pass an error to the callback, the next function is not executed, and the main callback is immediately called with the error.

What are a-sync-waterfall's main functionalities?

Running asynchronous tasks in series

This feature allows you to run multiple asynchronous tasks in series, where each task waits for the previous one to complete before starting. The results of each task are passed to the next task in the array.

const waterfall = require('a-sync-waterfall');

waterfall([
  function(callback) {
    setTimeout(() => {
      console.log('Task 1');
      callback(null, 'one');
    }, 1000);
  },
  function(arg1, callback) {
    setTimeout(() => {
      console.log('Task 2');
      callback(null, 'two');
    }, 500);
  },
  function(arg1, callback) {
    setTimeout(() => {
      console.log('Task 3');
      callback(null, 'three');
    }, 100);
  }
], function (err, result) {
  if (err) {
    console.error('Error:', err);
  } else {
    console.log('All tasks completed. Final result:', result);
  }
});

Error handling in series of tasks

This feature demonstrates how errors are handled in a series of tasks. If any task passes an error to the callback, the subsequent tasks are not executed, and the main callback is immediately called with the error.

const waterfall = require('a-sync-waterfall');

waterfall([
  function(callback) {
    setTimeout(() => {
      console.log('Task 1');
      callback(null, 'one');
    }, 1000);
  },
  function(arg1, callback) {
    setTimeout(() => {
      console.log('Task 2');
      callback('Error in Task 2');
    }, 500);
  },
  function(arg1, callback) {
    setTimeout(() => {
      console.log('Task 3');
      callback(null, 'three');
    }, 100);
  }
], function (err, result) {
  if (err) {
    console.error('Error:', err);
  } else {
    console.log('All tasks completed. Final result:', result);
  }
});

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Package last updated on 31 Aug 2018

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