Scala | All Algorithms implemented in Scala | Learning library

I have updated IntelliJ Idea Ultimate and scala plugin, it's working ok so far with sbt to build some projects.

Using a scala worksheet in REPL Interactive mode, I put in some code from a course lecture,

I have my own API wrote in Play Scala and frontend client wrote in react.js I can't send logout request (I use OAuth2), because i get error with cors headers. I tried to fix it but i can't.

My react fetch method:

I followed the instructions at Structured Streaming + Kafka and built a program that receives data streams sent from kafka as input, when I receive the data stream I want to pass it to SparkSession variable to do some query work with Spark SQL, so I extend the ForeachWriter class again as follows:

I'm confused why a type that implements comparable isn't "implicitly comparable", and also why certain syntaxes of sortWith won't compile at all:

I have sample tests used from scalatest.org site and maven configuration again as mentioned in reference documents on scalatest.org, but whenever I run mvn clean install it throws the compile time error for scala test(s).

Sharing the pom.xml below

I am trying to write a unit test code for my Spark-Scala notebook using scalatest.funsuite but the notebook with test() is not getting executed in databricks. Could you please let me know how can I run it?

Here is the sample test code for the same.

I am new to Spark and am trying to run on a hadoop cluster a simple spark jar file built through maven in intellij. But I am getting classnotfoundexception in all the ways I tried to submit the application through spark-submit.

My pom.xml:

I cannot add a package description in ScalaDoc with Scala 3

I an trying to define a custom schema for the following XML using spark and scala.