map with Object

[allevo]

I'm very happy if async can accept an Object as first parameter of map. The behaviour is like parallel, the result is an object with the same keys of the input.

Are you interested in?

[Sitin]

I support this idea. Lodash support this feature.
The question is: what to do with getters/setters and freezes. Should we recreate them as well? Any ideas?

[allevo]

The idea is to iterate over all keys of object and map the values without creating as result an object with special property. This is to avoid any kind of hellhounds or side effect!

[aearly]

As a workaround, you can convert your object to an array of [key, value] tuples and then zip the result back up. Easy with _.pairs and _.zipObject, if you're using Lodash.

async.map(_.pairs(obj), function (tuple, cb) {
  var key = tuple[0];
  var value = tuple[1];
  // do something with key and value
  //..
  cb(null, [key, newValue]);
}, function (err, result) {
  if (err) return callback(err);
  callback(null, _.zipObject(result));
})

[aearly]

Dupe of #321