btc | Command-line BitTorrent remote control

You're asking for all the symbols (exchangeInfo) and then getting the candle info (klines) for each symbol (= currency pair).

You can do so just for the GBP pairs by looking for GBP in the two currencies you're currently iterating on, by adding this to your foreach:

The approach would be simple. We take each key of json object and we replace its digit part with empty string then copy the data of old key to new key and delete the old key.

You need to do things slightly different when you're defining a struct, and when you're instantiating a struct.

When you write:

It's not possible to include a collection of objects as a value to a key without wrapping them in an array in JSON. (source (W3Schools))

It is possible, on the other hand, to have a collection of objects, but each one would have to have its own unique key. So the response could be shaped as such:

I believe you could achieve this very easily using string slicing:

Your JSON structure is like this

Can you check the below snippet and let me know if something like this is what you are expecting?

You are doing the correct thing to send the message: socket.next(...), however you need to ensure you are subscribing to your socket. From the rxjs docs:

Note that at least one consumer has to subscribe to the created subject - otherwise "nexted" values will be just buffered and not sent

It looks like you are re-implementing features already provided by RxJS WebSocket. You don't need a connect() method nor a close() method. This is because the socket connection is automatically made when there is a subscriber, and closed when there are no subscribers.

Also, you don't need to have a separate MessagesSubject, just define messages$ from your socket$.

Your service could be simplified to this:

I think you need bs4 module: