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Les fonctions de rappel (callbacks) sont la primitive de base, bas-niveau, pour l'asynchronie en JavaScript. Cette partie les explore en détail en prenant soin d'illustrer les pièges classiques, bonnes et mauvaises pratiques, pour mieux apprécier ensuite les solutions apportées par les promesses puis async/await.

Vous pouvez télécharger l'ensemble des exemples de code pour vos propres essais sur votre machine, ainsi que l'ensemble des vidéos si vous avez besoin de pouvoir les visionner sans connexion internet

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Les promesses sont une abstraction déjà ancienne, même en JS où elles ont été formalisées en 2012 avec Promises/A+. Souvent mal comprises et sous-utilisées, elles règlent pour de bon nombre de pièges inhérents aux callbacks « nus », et offrent de grandes possibilités de composition.

Vous pouvez télécharger l'ensemble des exemples de code pour vos propres essais sur votre machine, ainsi que l'ensemble des vidéos si vous avez besoin de pouvoir les visionner sans connexion internet.

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En intégrant la gestion des promesses à la syntaxe-même du langage, async/await en simplifie radicalement l'utilisation tout en optimisant encore davantage les performances de notre code.

C'est un peu le Saint Graal : du code asynchrone, non-bloquant, qui se lit aussi aisément que du code synchrone bloquant traditionnel !

Vous pouvez télécharger l'ensemble des exemples de code pour vos propres essais sur votre machine, ainsi que l'ensemble des vidéos si vous avez besoin de pouvoir les visionner sans connexion internet.

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