asyncAll example

asyncAll.js

/*
 * A simple asyncAll example.
 *
 * Ignores any error handling and only returns the results to the done callback.
 * Each task is expected to take a callback for its first parameter.
 */

// Example call:
asyncAll([doSomething, doSomethingElse], function (results) {
  console.log('all done', results);
})

// Using Array.forEach
function asyncAll(tasks, done) {
  var count = arr.length;
  var results = new Array(count);

  tasks.forEach(function(task, i) {
    task(function(result) {
      results[i] = result;
      count -= 1;
      if (count === 0) {
        done(results);
      }
    })
  })
}

// Using traditional for-loop with var (IIFE)
function asyncAll(tasks, done) {
  var count = arr.length;
  var results = new Array(count);

  for (var i = 0, len = count; i < len; ++i) {
    (function (i) {
      tasks[i](function(result) {
        results[i] = result;
        count -= 1;
        if (count === 0) {
          done(results);
        }
      })
    }(i))
  }
}