promise in javascript

const fs = require('fs')

const readFileWithPromise = file => {
  return new Promise((resolve, reject) => {
    fs.readFile(file, (err, data) => {
      if (err) {
        reject(err)
      } else {
        resolve(data)
      }
    })
  })
}

readFileWithPromise('/etc/passwd')
  .then(data => {
    console.log(data.toString())
    return readFileWithPromise('/etc/profile')
  })
  .then(data => {
    console.log(data.toString())
  })
  .catch(err => {
    console.log(err)
  })

Hàm lày ngày trong tuần javascript

Await in a for loop

How to Await in a for loop

Làm phẳng mảng dùng phương pháp đệ quy

Spread Operator for Objects

Using the spread operator during an Object declaration will assign the properties of the referenced Object to the new Object.

group by property javascript use reduce