compactmap | Memory efficient java.util.Map implementation | Map library

The fundamental issue here is that tableView(_:viewForHeaderInSection:) is a pull based method and Rx is designed for push based systems. Obviously it can be done. After all, the base library did it for tableView(_:cellForRowAt:) but it's quite a bit more complex. You can follow the same system that the base library uses for the latter function.

Below is such a system. It can be used like this:

First, be careful about the number of requests that you perform. The docs say:

• Send at most one geocoding request for any one user action.

• If the user performs multiple actions that involve geocoding the same location, reuse the results from the initial geocoding request instead of starting individual requests for each action.

• When you want to update the user’s current location automatically (such as when the user is moving), issue new geocoding requests only when the user has moved a significant distance and after a reasonable amount of time has passed. For example, in a typical situation, you should not send more than one geocoding request per minute.

And the old Location and Maps Programming Guide says:

The same CLGeocoder object can be used to initiate any number of geocoding requests but only one request at a time may be active for a given geocoder.

So, the whole idea of rapidly issuing a series of geolocation requests may be imprudent, and even if you were to do just a few, I would be inclined to avoid performing them concurrently. So, I would consider a simple for loop, e.g.:

Error says that you have wrong field name isGraterThenOrEqualTo: it should be greaterThanOrEqual: and bad order of .order() method. Try bellow example.

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This my friend is where dictionaries come in handy. A dictionary has two parts Key and Value or in swift terms ["Key":"Value"] There are three things to note about a dictionary.

• #1, all key-value-pairs MUST be the same type, for example, [32:"String", 33: "String"] Which is important to remember.
• #2, it does NOT guarantee order.
• #3, It can only contain unique keys.

How does this apply to your problem? Well, it has to do with the type of data that you have. Currently you have 2 separate arrays, one with the Country, and one with the Codes. You can combine them into the dictionary and ensure that they are always together, referencing the value from the key, or searching for the value, to get a key or multiple keys. That previous sentence is important to pay attention to, though not for your case, you're guaranteed to only get one value for one key, but you can get multiple keys from one value. In your case you have a unique country, and unique ID.

You might try using Regular Expressions...

By default, Observables are cold. This means that each subscription works independently and in this case each subscription is getting a different EditorViewModel. (The .map { EditorViewModel(user: $0) } Observable will call its closure for each subscription.)

Adding a .share() or .share(replay: 1) after the .map { EditorViewModel(user: $0) } Observable will make it hot which means that all subscriptions will share the same effect.

As to your sub-question. I don't think I would setup such a system unless something outside of this code forced me to. Instead, I would pass an Observable into the EditorViewModel instead of a raw User. That way you don't need to rebuild editor view models every time the user changes.

The problem is your ForEach. Despite that fact that Person conforms to Identifiable, you're using \.self to identify the data. Because of that, every time an aspect of the Person changes, so does the value of self.

Instead, just use this form, which uses the id vended by Identifiable:

The only way I can think of is to reinvent your own ViewBuilder:

Your problem is likely in code you haven't shown. Note that the below code compiles, runs and works: