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Javascript -> JavaScript (English) (#35183)

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* Javascript -> JavaScript (English)

* Update technical documentation page for required change

* Update use-class-syntax-to-define-a-constructor-function.english.md

* Update left-factorials.md
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Lipis
2019-03-28 09:35:41 +01:00
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guide/english/csharp/async-await/index.md
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@@ -4,7 +4,7 @@ title: Async / Await
# Async / Await Keywords
The `async`/`await` keywords in C# provide convenient ways of managing resource-intensive applications, which are more common in front-end languages such as Javascript libraries. Methods that return `Task<T>` types can be crowned with the `async` keyword, and when calling these methods in a UI handler or service workflow, we can use the `await` on the methods to tell C# to yield the control back to its caller until the background job is finished. By yielding the control on resources-intensive calls, we are able to allow UI to be more responsive and make the service more elastic.
The `async`/`await` keywords in C# provide convenient ways of managing resource-intensive applications, which are more common in front-end languages such as JavaScript libraries. Methods that return `Task<T>` types can be crowned with the `async` keyword, and when calling these methods in a UI handler or service workflow, we can use the `await` on the methods to tell C# to yield the control back to its caller until the background job is finished. By yielding the control on resources-intensive calls, we are able to allow UI to be more responsive and make the service more elastic.
The core of the `async` and `await` are the `Task<T>` class. When using it along with the `async` keyword as the return type of a method, we indicate that the method has promised to return an object of the `T` type (for methods that wouldn't return any value, use `Task` as the return type instead). `Task<T>` is a sophisticated topic of its own, for more information, please refer to the official documents: [Task Class](https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.task?view=netframework-4.7.1).