MetaLab | design nanophotonic structures , surface plasmon devices | Machine Learning library

I am a regex beginner and I have been practicing by going through a problem on this website. I am given the following text:

I'm new to Kotlin and the coroutines. However I want to use it to initialize the Android ThreeTen backport library which is a long running task. I'm using the Metalab Async/Await Library (co.metalab.asyncawait:asyncawait:1.0.0).

This is my code:

In this post, users were able to select a column from the dataframe using a dropdown, select some values to compare from that column using some checkboxes, and add a new column to the same frame reflecting the comparisons that they wanted to make.

I realize I need something more complex, where users are able to select multiple columns from a dataframe and generate a similar result in the dataframe. Here is an illustration of the more complex final table. In this example, the user has selected the Author.Name and Fav.Color columns to look at and have selected the populated values: Bob, Tom, Green, Red. This will then produce two new columns, one comparing Green vs Red with Bob and the other with Tom.

Very new to R Shiny! I've looked through a good 20 questions but they don't necessarily address the problem I'm facing.

I have a few dataframes generated from API calls that look something like this: