If you wonder what the Applicative instance for functions looks like and what you can do with it, then take a look at this.
Function Applicative for Great Good of Palindrome Checker Function - Polyglot FP for Fun and Profit – Haskell and Scala - Embark on an informative and fun journey through everything you need to know to understand how the Applicative instance for functions makes for a terse palindrome checker function definition in point-free style.