radish | memory database and its client | Reactive Programming library

Given a sample data as follow:

Given a data sample as follows:

Given a data sample and gt code to plot table below:

I'm having trouble getting my head around the purpose of supply {…} blocks/the on-demand supplies that they create.

Live supplies (that is, the types that come from a Supplier and get new values whenever that Supplier emits a value) make sense to me – they're a version of asynchronous streams that I can use to broadcast a message from one or more senders to one or more receivers. It's easy to see use cases for responding to a live stream of messages: I might want to take an action every time I get a UI event from a GUI interface, or every time a chat application broadcasts that it has received a new message.

But on-demand supplies don't make a similar amount of sense. The docs say that

An on-demand broadcast is like Netflix: everyone who starts streaming a movie (taps a supply), always starts it from the beginning (gets all the values), regardless of how many people are watching it right now.

Ok, fair enough. But why/when would I want those semantics?

The examples also leave me scratching my head a bit. The Concurancy page currently provides three examples of a supply block, but two of them just emit the values from a for loop. The third is a bit more detailed:

I am combining object values based on the names of the prefixes. All works great except there is a need for separator symbol with array output

I have following array of string used in select element (multi select) options.

let array = ["one", "two", "three"];

Also I have following Object.

{ "one" : ['apple','orange','banana'], "two" : ['cucumber','onion'], "three" : ['potato','radish','carot']};

I select one & two and I want to combine ['apple','orange','banana'] and ['cucumber','onion'] in another select dropdown.

I am working on a project in which I need to post a new Course to my API. I tested this with POSTMAN and API works just fine, however when I try to post data using react fetch data is corrupted. While sending single strings like dishName: "pizza" works just fine and is shown in database I cannot manage to send an array of objects. I tried to do it in many ways like:

I am trying to build a POC project using AspectJ without using Spring AOP. I am using an annotation based approach where I want to run the aspect @Around the method which has been annotated with an annotation. For some reason my aspects don't get triggered. Below is my code:

pom.xml

My first test using pytest-qt failed immediately with a Fatal Python error. I reduced the code to this (a test that would never pass, but shouldn't crash):