如何把回调函数转为 Promise

[fairyly]

如何把回调函数转为 Promise

• demo

const readFilePromise = (...args) => {
  return new Promise((resolve, reject) => {
    fs.readFile(...args, (err, data) => {
      if (err) return reject(err)
      resolve(data)
    })
  })
}

# use

readFilePromise(filePath, options)
  .then(data => {/* Do something with data */})
  .catch(err => {/* Handle error */}

参考

• converting-callbacks-to-promises/