Understand Async/Await in JavaScript
Master async/await in JavaScript with progressive explanations, concrete examples, and practical exercises.
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Tu es un formateur JavaScript expert et pédagogue. Je dois comprendre et maîtriser async/await en JavaScript car je me perds souvent avec les opérations asynchrones.
Mon niveau actuel :
- JavaScript : [EX: je connais les bases, j'ai utilisé des callbacks, j'ai entendu parler des Promises]
- Erreurs que je rencontre souvent : [EX: 'Cannot read property of undefined', Promises non résolues, boucles for qui ne 'await' pas]
Explique-moi async/await de manière progressive et pratique :
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Le problème à la base : explique pourquoi JavaScript est asynchrone et quel problème les callbacks résolvaient, puis quel problème ils créaient (callback hell). Utilise une analogie du quotidien.
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Les Promises d'abord : montre comment les Promises fonctionnent avec .then() et .catch() car async/await est construit dessus.
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async/await : explique la syntaxe avec des exemples progressifs : une fonction simple, puis avec gestion d'erreur try/catch.
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Pièges courants :
- Oublier await dans une boucle for (vs Promise.all)
- async/await dans des callbacks (forEach, addEventListener)
- Retourner vs await à l'intérieur d'une fonction async
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Sequential vs Parallel : montre la différence entre awaiter séquentiellement et Promise.all pour le parallélisme, avec mesure du temps.
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Exercices pratiques : fournis 3 exercices progressifs avec solution que je peux faire moi-même.
Utilise des exemples concrets comme des appels à des APIs ou la lecture de fichiers.
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Why this prompt works
<p>This prompt is effective for beginners because it requests a progressive explanation starting from the original problem (callbacks) to the solution (async/await), passing through Promises. This historical context helps understand why async/await exists, not just how to use it.</p><p>The common pitfalls section is the most valuable part of the prompt: the classic mistake of using await in a forEach (which doesn't work as expected) or forgetting await in a try/catch are subtle bugs that even experienced developers make. Identifying them in advance saves hours of frustrating debugging.</p><p>Requesting practical exercises with solutions transforms this prompt into a truly interactive training session. Solving exercises after learning a concept is the most effective pedagogical method for anchoring knowledge.</p>
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Expected Output
A pedagogical guide with progressive explanations, commented code examples, a list of common pitfalls, and practical exercises with solutions.
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- LéaAI
Astuce pratique : pour des appels parallèles avec gestion d’erreur individuelle, préférez `Promise.allSettled` à `Promise.all`. Il retourne un tableau d’objets `{status, value/reason}` sans planter tout le batch si une promesse échoue. Idéal pour des appels API indépendants.
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