dupontL3

exercice

Réécrire ce code avec async

On modifiera la lig.2 par const readline = require('readline').promises;

const fs = require('fs');
const readline = require('readline');
const { stdin: input, stdout: output } = require('process');

const rl = readline.createInterface({ input, output });

rl.question('give some file names? ', (f) => {

  const filenames = f.split(" ");
  let counts = filenames.map(f => {
    try {
      const data = fs.readFileSync(f, { encoding: 'utf8' });
      return `${f}: ${data.split('\n').length} lines`;
    } catch (err) {
      return `${f}: couldn't read file`;
    }
  });
  console.log(counts.join('\n'));


  rl.close();
});

Async/sync

Code synchrone / bloquant

const { readFileSync, writeFileSync } = require('fs')
console.log('start')
const first = readFileSync('./content/first.txt', 'utf8')
const second = readFileSync('./content/second.txt', 'utf8')

writeFileSync(
  './content/result-sync.txt',
  `Here is the result : ${first}, ${second}`,
  { flag: 'a' }
)
console.log('end')
console.log('new')

Code asynchrone / non bloquant

const { readFile, writeFile } = require('fs')

console.log('start')
readFile('./content/first.txt', 'utf8', (err, result) => {
  if (err) {
    console.log(err)
    return
  }
  const first = result
  readFile('./content/second.txt', 'utf8', (err, result) => {
    if (err) {
      console.log(err)
      return
    }
    const second = result
    writeFile(
      './content/result-async.txt',
      `Here is the result : ${first}, ${second}`,
      (err, result) => {
        if (err) {
          console.log(err)
          return
        }
        console.log('end')
      }
    )
  })
})

console.log('new')

Code asynchrone / non bloquant / promese

const { readFile, writeFile } = require('fs').promises

console.log('start');
let result = "";
readFile('./content/first.txt', 'utf8')
  .then((text) => {
    result = result.concat(text);
    return readFile('./content/second.txt', 'utf8')
  })
  .then((text) => {
    result = result.concat(text);
    writeFile('./content/promise.txt', `result: ${result}`, { flag: 'a' })
  })
  .then(() => console.log('end'))
  .catch((err) => console.log(err))
console.log('new');

Code asynchrone / non bloquant / async

const { readFile, writeFile } = require('fs').promises

console.log('start');
const start = async () => {
  try {
    const first = await readFile('./content/first.txt', 'utf8')
    const second = await readFile('./content/second.txt', 'utf8')
    await writeFile('./content/async.txt',`result : ${first} ${second}`,{ flag: 'a' })
    console.log('end');
  } catch (error) {
    console.log(error)
  }
}

start()
console.log('new');

Notez le code exécuté en paralléle.const { readFile, writeFile } = require('fs').promises

console.log('start');
const read1 = readFile('./content/first.txt', 'utf8')
const read2 = readFile('./content/second.txt', 'utf8')

Promise.all([read1, read2]).then((values) => {
  writeFile('./content/promise.txt', `result: ${values.join(" ")}`, { flag: 'a' })
  console.log('end');
});
console.log('new');

DM : Affichage des règles d'un jeu !

J'aimerais afficher les règles du jeu !

Rules of the game

Rule 1: 🧻 wins 🪨

Rule 2: 🪨 wins ✂️

Rule 3: ✂️ wins 🧻

✂️ plays against 🧻

RULE : ✂️ would winw against 🧻

🏆PLAYER1 WINS

Mais comment eviter ce genre d'écriture !

if (player1 == '🪨' && player2 == '🧻' ||
  player1 == '🧻' && player2 == '✂️' ||
  player1 == '✂️' && player2 == '🪨') {
  msg = 'player1 lost';
}
if (player1 == '🪨' && player2 == '✂️' ||
  player1 == '🧻' && player2 == '🪨' ||
  player1 == '✂️' && player2 == '🧻') {
  msg = 'player1 win';
}

Il est clair qu'il faut pouvoir changer de formes ou des règles facilement !

Rules of the game

Rule 1: 1️⃣ wins 2️⃣

Rule 2: 2️⃣ wins 3️⃣

Rule 3: 3️⃣ wins 1️⃣

3️⃣ plays against 2️⃣

RULE : 3️⃣ would win against 1️⃣

PLAYER1 LOSES!

Rules of the game

Rule 1: ✌️ wins 🖖

Rule 2: 🖖 wins ✊

Rule 3: ✊ wins ✌️

🖖 plays against 🖖

RULE : 🖖 would win against ✊

DRAW

Plus d'infos »

ChatGPT : let's start

Let's start cloning : https://github.com/dupontdenis/Openai.git

Le cours sur Class / distantiel

Class

Cours

TD

🚗🪛

DM🚗et héritage🏎️🚙

Créer une class Car avec les propriétés d'instances : fuel et distance

fuel = 0;
distance = 0;

Ajouter la méthode move

si le niveau de .fuel < 1
throw new RangeError('Fuel tank is depleted')
sinon la valeur de fuel diminue de 1 et la distance augmente de 2

Ajoutez une méthode addFuel qui ajoute une unité au fuel

si le niveau n'est pas supérieur à 10 sinon
throw new RangeError('Fuel tank is full')

Ajoutez une méthode statique isFaster qui compare la vitesse (topSpeed) de deux voitures. On ajoute pour cela au constructeur une propriété .topSpeed = Math.random()

Créer une classe Tesla qui hérite de Car

Ajouter à Tesla une méthode move()

Move appelle la méthode move de Car avec une distance de 4.

Modifier le code pour que Tesla soit quatre fois plus rapide qu'une Car

help