Run an array of functions in series, each passing its results to the next function (waterfall)
Last updated 2 years ago by feross .
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$ cnpm install run-waterfall 
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Run an array of functions in series, each passing its results to the next function

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npm install run-waterfall


waterfall(tasks, [callback])

Runs the tasks array of functions in series, each passing their results to the next in the array. However, if any of the tasks pass an error to their own callback, the next function is not executed, and the main callback is immediately called with the error.

  • tasks - An array of functions to run, each function is passed a callback(err, result1, result2, ...) it must call on completion. The first argument is an error (which can be null) and any further arguments will be passed as arguments in order to the next task.
  • callback(err, [results]) - An optional callback to run once all the functions have completed. This will be passed the results of the last task's callback.
var waterfall = require('run-waterfall')

  function (callback) {
    callback(null, 'one', 'two')
  function (arg1, arg2, callback) {
    // arg1 now equals 'one' and arg2 now equals 'two'
    callback(null, 'three')
  function (arg1, callback) {
    // arg1 now equals 'three'
    callback(null, 'done', 'wohoo')
], function (err, result1, result2) {
   // result1 now equals 'done'
   // result2 now equals 'wohoo'

This module is basically equavalent to async.waterfall, but it's handy to just have the functions you need instead of the kitchen sink. Modularity! Especially handy if you're serving to the browser and need to reduce your javascript bundle size.

Works great in the browser with browserify!

see also


MIT. Copyright (c) Feross Aboukhadijeh.

Image credit: Waterfall designed by Luis Prado

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