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Event loop: microtasks and macrotasks by nico-m-64 · Pull Request #398 · javascript-tutorial/fr.javascript.info · GitHub

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Event loop: microtasks and macrotasks #398

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Merged
HachemiH merged 3 commits into from
Oct 13, 2022
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Event loop: microtasks and macrotasks #398

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trad fr event loop
nico-m-64 Aug 26, 2022
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trad fr event loop solution
nico-m-64 Aug 26, 2022
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trad fr event loop exercise
nico-m-64 Aug 26, 2022
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      • solution.md
      • task.md
    • article.md
48 changes: 24 additions & 24 deletions 2-ui/99-ui-misc/03-event-loop/2-micro-macro-queue/solution.md
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The console output is: 1 7 3 5 2 6 4.
La sortie console est : 1 7 3 5 2 6 4.

The task is quite simple, we just need to know how microtask and macrotask queues work.
La tâche est assez simple, nous avons juste besoin de savoir comment fonctionnent les files d'attente pour microtâches et macrotâches.

Let's see what's going on, step by step.
Voyons ce qui se passe, étape par étape.

```js
console.log(1);
// The first line executes immediately, it outputs `1`.
// Macrotask and microtask queues are empty, as of now.
// La première ligne s'exécute immédiatement, elle sort `1`.
// Les files d'attente Macrotask et Microtask sont vides, pour l'instant.

setTimeout(() => console.log(2));
// `setTimeout` appends the callback to the macrotask queue.
// - macrotask queue content:
// `setTimeout` ajoute la callback à la file d'attente macrotask.
// - la file d'attente macrotask contient:
// `console.log(2)`

Promise.resolve().then(() => console.log(3));
// The callback is appended to the microtask queue.
// - microtask queue content:
// La callback est ajoutée à la file d'attente des microtâches.
// - contenu de la file d'attente des microtâches:
// `console.log(3)`

Promise.resolve().then(() => setTimeout(() => console.log(4)));
// The callback with `setTimeout(...4)` is appended to microtasks
// - microtask queue content:
// La callback avec `setTimeout (...4) `est ajoutée aux microtâche
// - contenu de la file d'attente des microtâches:
// `console.log(3); setTimeout(...4)`

Promise.resolve().then(() => console.log(5));
// The callback is appended to the microtask queue
// - microtask queue content:
// La callback est ajoutée à la file d'attente des microtâches
// - contenu de la file d'attente des microtâches:
// `console.log(3); setTimeout(...4); console.log(5)`

setTimeout(() => console.log(6));
// `setTimeout` appends the callback to macrotasks
// - macrotask queue content:
// `setTimeout` ajoute la callback aux macrotasks
// - contenu de la file d'attente macrotask:
// `console.log(2); console.log(6)`

console.log(7);
// Outputs 7 immediately.
// Affiche 7 immédiatement.
```

To summarize,
Pour résumer,

1. Numbers `1` и `7` show up immediately, because simple `console.log` calls don't use any queues.
2. Then, after the main code flow is finished, the microtask queue runs.
- It has commands: `console.log(3); setTimeout(...4); console.log(5)`.
- Numbers `3` и `5` show up, while `setTimeout(() => console.log(4))` adds the `console.log(4)` call to the end of the macrotask queue.
- The macrotask queue is now: `console.log(2); console.log(6); console.log(4)`.
3. After the microtask queue becomes empty, the macrotask queue executes. It outputs `2`, `6`, `4`.
1. Les numéros `1` & `7` apparaissent immédiatement, car les appels simples `console.log` n'utilisent aucune file d'attente.
2. Ensuite, une fois le flux de code principal terminé, la file d'attente des microtâches s'exécute.
   - Il possède les commandes: `console.log (3); setTimeout (...4); console.log (5) `.
   - Les nombres `3` & `5` apparaissent, tandis que `setTimeout (() => console.log (4))` ajoute l'appel `console.log (4)` à la fin de la file d'attente macrotask.
   - La file d'attente macrotask est maintenant: `console.log (2); console.log (6); console.log (4) `.
3. Une fois la file d'attente des microtâches vide, la file d'attente des macrotasques s'exécute. Il sort `2`, `6`, `4`.

Finally, we have the output: `1 7 3 5 2 6 4`.
Au final, nous avons la sortie: `1 7 3 5 2 6 4`.
2 changes: 1 addition & 1 deletion 2-ui/99-ui-misc/03-event-loop/2-micro-macro-queue/task.md
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---

# What will be the output of this code?
# Quelle sera la sortie de ce code?

```js
console.log(1);
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