async.js each get index in iterator

Question

I'm using caolan's async.js library, specifically the .each method.

How do you get access to the index in the iterator?

async.each(ary, function(element, callback){   //do stuff here for each element in ary   //how do I get access to the index? }, function(err) {   //final callback here }) 

Answer 1

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.