demobook | Feel free to publish files from anywhere | Runtime Evironment library

I have got so far with this but as I am relatively new to JavaScript have soon become quite stuck. I would like to randomly show a div that fades in, if visible for 5 seconds and then fades out. There should then be a 10 second delay before the next random div appears. Ideally no two divs should show back to back.

If possible could the delay between showing one then another be random between 10-20 seconds?

I have a SwiftUI question which doesn't look like it's answered or a duplicate of another issue, and SwiftUI is rather new.

The following code, with my understanding, show toggle the background of the Button control. The number of likes increments as expected, but the state changes don't seem to pass through to the Book struct.

Everything I have read is that in the preview, you need to use: .constant(x) within the view of the PreviewProvider.

However, it doesn't work and the Button with likes does not the foreground, nor the background color.

When debugging the app, the result of the book isLiked does change. But the foreground/background colors do not.

Here is the code for the view.

I am following the spring.io blog here: https://spring.io/blog/2018/09/24/spring-data-jdbc-references-and-aggregates and have a sample SpringBoot app with Book and Author entities here: https://github.com/b-sridhar/spring-data-jdbc-example.

I get the following error: No value supplied for the SQL parameter 'demobook': No value registered for key 'demobook'

And while debugging noticed the SQL query that is executed is: INSERT INTO demo.book_author (author, demo.book) VALUES (:author, :demobook) which should have been INSERT INTO demo.book_author (author, book) VALUES (:author, :book). This happens because I have the @Table("demo.book") as the annotation for the Book entity. If I remove the demo schema in the table name then the tests in BookAndAuthorsTests go through fine.

How to set the schema for the table Book?