It should be several examples, each showing one of the following: Iterating over infinite lists (generators, lazy seq, whatever), polymorphism (if applicable),

It should be several examples, each showing one of the following: Iterating over infinite lists (generators, lazy seq, whatever), polymorphism (if applicable), pattern matching (if applicable), how one would pass functions around, how one would manipulate a date, how one would read and write to a file, how one would make an http request (with some error handling!), traits/mixins (or similar, if applicable) concurrency, parallelism, and use of built in List, Map data structures. While not exhaustive, to me those feel like common building blocks to my day that would showcase how easy it is to do things in a language.