functional-javascript-workshop/exercises/async_loops/problem.md

The basics of functional programming in JavaScript. No libraries required.

This code is broken!

A Java developer has committed this terrible code to our codebase and didn't test it!

```js
function loadUsers(userIds, load, done) {
  var users = []
  for (var i = 0; i < userIds.length; i++) {
    users.push(load(userIds[i]))
  }
  return users
}

module.exports = loadUsers
```

# Task

Fix this code! The callback should be called with all the users loaded.
The order of the users should match the order of supplied user ids. Because this function is asynchronous, we do not care about its return value.

## Arguments

* userIds: an Array of numeric user ids.
* load: a Function used to load user objects. Expects a numeric id and a callback. The callback will be called with the result of loading the user with the specified id (either a user object or null).
* done: a Function that expects an Array of user objects (as retrieved from `load`).

## Conditions

* Do not use for/while loops (Array#forEach ok).
* The order of the results in `done` must be the same as they were specified in `userIds`.
* Users should be loaded in parallel i.e. the entire job should not take more than 1 second.
* Do not create any unnecessary functions e.g. helpers.

## Hint

* You don't need to use a sort to maintain ordering.
* Using `console.log` will affect verification. Only use `console.log` when using `functional-javascript run`.

## Boilerplate

```js
function loadUsers(userIds, load, done) {
  var users = []
  for (var i = 0; i < userIds.length; i++) {
    users.push(load(userIds[i]))
  }
  return users
}

module.exports = loadUsers
```