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(elemen         


        

Answer 1

1. indexOf solution is slow and should not be used for large arrays.
2. eachSeries solution by Merc does't make what you want.
3. Effective workaround is just to build another array with indexes:

someArrayWithIndexes = someArray.map(function(e, i) {return {obj: e, index: i}});
async.each(someArrayWithIndexes , function(item, done){
    console.log("Index:", item.index);
    console.log("Object:", item.obj);
});