Callback in javascript

const fs = require('fs')
fs.readFile('/etc/passwd', (err, data) => {
  if (err) {
    console.error(err)
    return
  }
  console.log(data.toString())
})

Sử dụng callback rất hạn chế ví dụ :

fs.readFile(fileA, function (err, data) {
  fs.readFile(fileB, function (err, data) {
    // ...
  })
}

Có thể bạn đã miss một số snippets code

closure javascript

Rest Operator for Objects

Now we can use rest on the properties of an Object. It allows us to explicitly extract certain named variables, and assign any uncalled variables into a catchall Object.

Convert Array-like to True Array

Await in a for loop

How to Await in a for loop

try/catch es10

An update for developer convience allows the use of try/catch without an explicit e Error reference in the catch call.