You can use async.forEachOf – it calls its iterator callback with the index as its second argument. > async.forEachOf([‘a’, ‘b’, ‘c’], function () {console.log(arguments)}); { ‘0’: ‘a’, ‘1’: 0, ‘2’: [Function] } { ‘0’: ‘b’, ‘1’: 1, ‘2’: [Function] } { ‘0’: ‘c’, ‘1’: 2, ‘2’: [Function] } see the docs for more info.
The final function does not get called because async.forEach requires that you call the callback function for every element. Use something like this: async.forEach(Object.keys(dataObj), function (item, callback){ console.log(item); // print the key // tell async that that particular element of the iterator is done callback(); }, function(err) { console.log(‘iterating done’); });
It appears that async.waterfall allows each function to pass its results on to the next function, while async.series passes all results to the final callback. At a higher level, async.waterfall would be for a data pipeline (“given 2, multiply it by 3, add 2, and divide by 17”), while async.series would be for discrete tasks … Read more