callbacks.js

// fs_stat :: String -> (Error -> Stat -> ()) -> ()
var fs_stat = _.curry(fs.stat, 2);

// paths :: [String]
var paths = ['file1.txt', 'file2.txt', 'file3.txt'];

// tmp :: [(Error -> Stat -> ()) -> ()]
var tmp = paths.map(oneparam(fs_stat));

// async.parallel :: [(Error -> a -> ()) -> ()] -> (Error -> [a] -> ()) -> ()
// statsCallback  :: (Error -> [a] -> ()) -> ()
var statsCallback = _.partial(async.parallel, tmp);

statsCallback(function (err, stats) {
  // use the stats
});

promises.js

// fs_stat :: String -> Promise Stat
var fs_stat = node.lift(fs.stat); // node = require("when/node");

// paths :: [String]
var paths = ['file1.txt', 'file2.txt', 'file3.txt'];

// tmp :: [Promise Stat]
var tmp = paths.map(oneparam(fs_stat));

// statsPromises :: Promise [Stat]
var statsPromises = when.all(tmp);

statsPromises.then(function(stats) {
  // use the stats
});

generators:

var fs = require('co-fs');
var co = require('co');

co(function *() {
  var paths = ['file1.txt', 'file2.txt', 'file3.txt'];

  var stats = yield paths.map(function(path) {
    return fs.stat(path);
  });

  // use the stats
})();