const data = [1, 2, 3, 4]
const results = []
let total = 0
for (let i = 0; i < data.length; i++) {
  myAsyncFunction(data[i], (result) => {
    results[i] = result
    total++

    if (total === data.length) {
      console.log(results)
    }
  })
}

function myFunction (callback) {
  getUserIds((ids) => {
    const results = []
    let total = 0

    for (let i = 0; i < ids.length; i++) {
      getUserInfo(ids[i], (info) => {
        results[i] = info
        total++

        if (total === ids.length) {
          callback(results)
        }
      })
    }
  })
}