A reminder about how to use async.js series functions

eachSeries.broken.js

// This will exit with the following error message: "RangeError: Maximum call stack size exceeded"

var async = require('async');

var c = 0;

async.eachSeries(new Array(5000),
  function process(item, next) {
    console.log(++c);
    next();
  },
  function onDone() {
    console.log('Done');
  }
);

eachSeries.working.js

// Using setImmediate we resolve the problem, as the iterator has to be async
// See: https://github.com/caolan/async/issues/267#issuecomment-14782072

var async = require('async');

var c = 0;

async.eachSeries(new Array(5000),
  function process(item, next) {
    console.log(++c);
    setImmediate(next);
  },
  function onDone() {
    console.log('Done');
  }
);