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I realize this may create more trouble than it solves, but if you don't plan to derive anything from MappingMeta, this seems to get around the problem (in that your code above runs).

You can get around the type inference by using another type parameter and filtering out the default values. You can even do this without having to make type assertions.

What you need is an interface which helps to act as a sort of callback. Your logical assumption is correct that since it is Async it returns after a while and till then the data is already gone back to your activity.

So here is what you can do. Create an interface.

Could it also be somehow re-emitting old events?

Yes, it probably is. BehaviorSubject has the unique property of immediately emitting the last value pushed to it as soon as you subscribe to it.

It's great when you want to model some persistent state value, and it's not good for events whose actual moment of occurrence is key. It sounds like the feedback messages you're working with fall into the second category, in which case Subject is probably a better choice.

does it look like each time this thing renders it subscribes and then unsubscribes to the above Subject?

Not exactly. useEffect accepts a callback, and within that callback you can optionally return a "cleanup" function. React will hang onto that function until the effect is triggered again, then it calls it to clean things up (which in this case consists of closing out the subscription) to make room for the next effect.

So in this case, the unsubscribe will only happen when the component is rendered with a new value for notifications$. Also worth pointing out that notifications$ will only change if it's either passed as a prop or created within the component function. If it's defined outside the function (imported from another file for example), you don't need to (and in fact should not) put it into useEffect's dependency array.

You can use str.split() and maybe use regular expressions.

https://www.geeksforgeeks.org/python-string-split/

However, instead of checking if there are spaces in email address, simply find and delete them using str.split(' ') and create valid email.

Java's implementation of native linkedlist has issues. There's no way to move nodes within a list or between lists, no equivalent to C++ std::list::splice(). All iterators to a link list become invalidated if there is an insertion or a deletion of a node anywhere in a linked list, unless the insert or delete is done using an iterator parameter, in which case all iterators but the one used to do the insert or delete are invalidated. Iterators can't be shallow copied, assignment just points the destination iterator to the same iterator object pointed to by the source iterator.

These issues make operations like merging or merge sort difficult, even more so for an iterator based operation.

In the case of Visual Studio C++ std::list, deletion of nodes only invalidates iterators to deleted nodes, and only in a debug build. In a release build, no iterators are invalidated, and it's up to the programmer to ensure deleted nodes don't result in iterators pointing to deleted objects.

As for why Java's native linkedlist has these limitations, Sun's stated reason at the time is they wanted a "compact framework" rather than be consistent with C++, which predates Java collections by 4 years (1998 for Java collections, 1994 HP copyright date shown at the end of most or all STL include files in the case of Visual Studio 2005 and prior versions of Microsoft and other C++ compilers). This is in spite of the fact that one of the predecessors to collections, JGL, did have the goal of being consistent with C++.

https://en.wikipedia.org/wiki/Java_collections_framework#History

There are other criticisms of Java, such as not having unsigned integers, treating primitives and objects differently, with a limited set of operations for primitives, ...

To preserve the offset during serialization/deserialization, yes - you should use the DateTimeOffset type instead of DateTime.

With regard to Azure Table Storage, while the SDKs support DateTimeOffset, unfortunately the service itself does not. Thus saving a DateTimeOffset value to Azure Storage will result in the equivalent UTC DateTime being stored, as given by the .UtcDateTime property of the DateTimeOffset. When retrieving, you will have a DateTimeOffset whose date and time are the equivalent UTC date and time, and the offset will be zero.

Thus, if you really need to keep track of the offset, you'll need to store that in a separate column, and combine the two in your controller upon return. The DateTimeOffset.ToOffset method is the easiest way to do that correctly.

Alternatively, if you only need the date and time parts to be correct, you could fib a little and use a UTC DateTime even if the value isn't actually in UTC. Just call DateTime.SpecifyKind with DateTimeKind.Utc on the way in, and with DateTimeKind.Unspecified on the way out. You'll loose the offset, but if you don't need it anyway then this can work.

I eventually figured out how to do it after a good night of sleep, here is a working version that uses the B1-Motion and ButtonRelease events instead of updating everytime one slider is moved because it would execute the command twice by just moving one slider. This led to the value being used for the calculation not being the current one because of how things are processed.

All you need to do is to specifytexture coordinates in range [0.0, 1.0]: