AliSawari

const keyInputs = [
  ['n', 1],
  ['e', 10],
  ['w', 100],
  [' ', 1],
  ['y', 10],
  ['o', 100],
  ['r', 300],
  ['k', 200]
];

AliSawari

{"lastUpload":"2020-05-27T15:30:36.153Z","extensionVersion":"v3.4.3"}

AliSawari

const { readFile } = require('fs')
const { promisify } = require('util')

const readFilePromise = promisify(readFile)

readFilePromise('myFile').then(data => {
  console.log(data.toString())
}).catch(e => console.log(e))

AliSawari

// import it!
const { promisify } = require("util")

// turn your ordinary func into a promise func!
const doublePromise = promisify(double)

// use it! 
doublePromise(14).then(res => {
  console.log(res)
}).catch(err => console.log(err))

AliSawari

function double(number, callback){
  if(number > 2){
    callback(null, number * 2)
  } else {
    callback(new Error("number should be more than 2"))
  }
}

AliSawari

// say take a number and return its double

// resolve : the success call . which goes in the first then
// reject : the error call, which goes in .catch

function double(number){
  return new Promise((resolve, reject) => {
    if(typeof number == 'number'){
      resolve(number * 2)
    } else reject("the argument should a Number")

AliSawari

// with each return , the value goes for the next then in chain
// you can chain as many thens as you want, even if you dont return a value

doSomething(args).then(result => {
  return result + 2
}).then(plusTwo => {
  return plusTwo + 2
}).then(plusFour => {
  // and the chain continues as many thens as you want...
}).catch(err => console.log(err))

AliSawari

// ok

AliSawari

const axios = require('axios')

...

const requestBody = {
  name: 'Akexorcist',
  age: '28',
  position: 'Android Developer',
  description: 'birthdate=25-12-1989&favourite=coding%20coding%20and%20coding&company=Nextzy%20Technologies&website=http://www.akexorcist.com/',
  awesome: true

AliSawari

var http = require("http");
var fs = require("fs");
var server = http.createServer().listen(3000);

server.on("request", function(req, res) {
  if (req.method != "POST") return res.end();
  var imageName = "received-" + Date.now() + ".jpg";
  var writeStream = fs.createWriteStream(imageName);

  req.pipe(writeStream);