javascript - Call variable number of functions in parallel? -

using async.parallel or custom control flow,

arr = [1, 2, 3, 4, 5, 3, 2, 3, 4, 5] //arr length  get_something = function(num, cb){   async_io(num, function (err, results){         cb()   });  }  

i want run get_something() on each member of array in "parallel". when they're finished i'd callback called results.

without async :

var n = arr.length, results = new array(n), oneisdone = function(index, result){    results[index] = result;    if (--n===0) callback(results); } arr.foreach(function(val i){      get_something(val, function(result){        oneisdone(i, result);     }); }); 

with async :

using async supposes asynchronous function accepts callback returning error first argument , result second, final callback :

async.parallel(arr, get_something, callback); 

if functions don't follow norm, you'll have make ugly wrappings.