File search example with Promise and with Async

file-search.js

fs = require('fs')

/*
 * Wrap old-style callback with promise explicitly created...
 */
const readfolderPromise = (folder) => {
  if (folder === undefined) {
    folder = process.cwd()
  }
  console.log(folder)

  var promise1 = new Promise(function(resolve, reject) {
    fs.readdir(folder, function (err, files) {
      if (err) {
        reject(err)
      } else {
      console.log("got files")
      resolve(files)
      }
    })
  })

  return promise1
}


/*
 * Wrap old-style callback with async...
 */
const readfolderAsync = async (folder) => {
  if (folder === undefined) {
    folder = process.cwd()
  }
  console.log(folder)
  return await new Promise(function(resolve, reject) {
    fs.readdir(folder, function (err, files) {
      if (err) {
        reject(err)
      } else {
      console.log("got files")
      f = files
      resolve(files)
      }
    })
  })
}

const callWithPromise = () => {
  readfolderPromise().then( (files) => {
    console.log(files)
  })
}

const callWithAsync = async () => {
  console.log(await readfolderAsync())
}

callWithPromise()
callWithAsync()