sleep-sort.js

const sleepSort = (arr) => {
  const { length } = arr
  const result = []

  return new Promise((resolve) => {
    for (let index = 0; index < length; index++) {
      const value = arr[index];
      
      setTimeout(() => {
        result.push(value)
        const isResultFull = result.length === length
        
        if (isResultFull) resolve(result)
      }, value)
    }
  })
}

const array = [3, 10, 7, 3, 1, 76, 53, 29, 4, 23]

sleepSort(array)
  .then(sortedArray => {
    console.log(sortedArray) // [ 1, 3, 3, 4, 7, 10, 23, 29, 53, 76 ] 
  })