How to async task in Unreal Engine

Unreal Engine has a nice feature called AsyncTask, which is used to execute a code asynchronously. It works by running certain code on a specified thread, and this functionality is mostly used when the task is heavy enough to be executed instantly without blocking the game thread.

It also provides a solution to all issues arising from multithreading, in particular, accessing parameters from one thread that are supposed to be used and/or edited in another thread. ¹

AsyncTask(ENamedThreads::AnyThread, []()
{
	// This code will run asynchronously, without freezing the game thread
});

You can also create nested calls to asynchronous tasks, for example:

AsyncTask(ENamedThreads::AnyThread, []()
{
	// This code will run asynchronously, without freezing the game thread
		
	AsyncTask(ENamedThreads::GameThread, []()
	{
		// This code will be executed on the game thread
	});
});

DECLARE_DYNAMIC_DELEGATE_OneParam(FAsyncDelegateExample, TArray<float>, OutData);

// Class, meta, etc

UFUNCTION(BlueprintCallable)
static void AddNumbersAsync(TArray<float> InData, FAsyncDelegateExample Result)
{
	AsyncTask(ENamedThreads::AnyThread, [InData = MoveTemp(InData), Result]() mutable
	{
		for (float& InDataElement : InData)
		{
			InDataElement += 10;
		}

		AsyncTask(ENamedThreads::GameThread, [OutData = MoveTemp(InData), Result]() mutable
		{
			Result.ExecuteIfBound(MoveTemp(OutData));
		});
	});
}