JavaScript Sleep sort

sleepSort.js

var list = [-1, 3, 15, 133, -3, 2]

function sleepSort(arr) {
  var ordered = []
  var q = []
  function afterWhile (x, resolve) {
    ordered.push(x)
    return resolve()
  }
  arr.forEach(n => {
    (x => {
      q.push(new Promise((resolve, reject) => {
        setTimeout(afterWhile, x, x, resolve)
      }))
    })(n)
  })
  Promise.all(q).then(() => {
    console.log('orderrd', ordered)
  })
}

console.log('list', list)
sleepSort(list)
// Result:
// a [ -1, 3, 15, 133, -3, 2 ]
// orderrd [ -1, -3, 2, 3, 15, 133 ]