I found that this lesson did not contain anything new, but it did build upon concepts explored earlier

• Higher Order Functions
• doseq

Please ensure you have a clojure environment running locally - see Getting Started Guide if you need to set one up.

Run the following comamnds from the root of the 15-slide-in-on-scroll

1. Run the projcet

clj -M:dev

-M assumes your using a Clojure Tools version greater than 1.10.3.855. Not sure what version your on? Run clj -h and you should see output near the top of the output like:

➜ clj -h
Version: 1.10.3.855 # this is the version your on

2. Visit the app

http://localhost:3000/

In this case we are using the global function debounce and passing our check-slide function to it.

We are not modifying the collection, we are only getting side effects. for can also be used for side effects, but it is going to return another list and this is not what we want to happen, so we use doseq. for is what's known as a list comprehension.