# Callback Hell vs. Promise vs. Async / Await

Dans un univers asynchrone, nous sommes amenés à utiliser des fonction de "callback" pour être informé du résultat du traitement.

Le chapitre [Callback Hell](/angular/callback-hell-vs.-promise-vs.-async-await/callback-hell.md) présente les limitations des "callback" "classiques" puis les chapitres suivants présentent progressivement des solutions de plus en plus élégantes et puissantes.

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Bien qu'il soit tentant d'aller directement au chapitre [Observables](/angular/observables.md), il est nécessaire de maitriser les [Promise](/angular/callback-hell-vs.-promise-vs.-async-await/promise.md) ainsi que l'approche [Async / Await](/angular/callback-hell-vs.-promise-vs.-async-await/async-await.md) qui s'avèrent pratiques dans certains cas.
{% endhint %}

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[Callback Hell](/angular/callback-hell-vs.-promise-vs.-async-await/callback-hell.md)
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[Promise](/angular/callback-hell-vs.-promise-vs.-async-await/promise.md)
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[Async / Await](/angular/callback-hell-vs.-promise-vs.-async-await/async-await.md)
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[Observables](/angular/observables.md)
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