local-4clj

Problems of the famous 4clojure site.

It is recommended that you create an account there, and do the problems in the order suggested.

This project provides the same problems, but with an embedded editor nightlight. You get a repl for free (to use it, toggle instaREPL in the interface), and parinfer will help you edit your first clojure forms.

You'll know you've solved the problem when all the test-cases evaluates to true. You should then copy-paste your solution on 4clojure, as it will allow you to study the solutions of other users (the whole point, really).

NB: If you have never written a single line of clojure, you should start with the clojure koans to discover the syntax, then come back to 4clojure.

Usage

If you have boot on your machine: boot wait nightlight --port 4000
If you have lein on your machine: lein nightlight --port 4000
If you have docker on your machine: ./docker-run.sh

If you have none of the above, my recommendation would be to install boot and go from there.

Open http://localhost:4000 in your favorite browser (with JS enabled), you should now see the interface of the [nightlight] editor. Go to the src directory (in the left side-bar), then to your current problem difficulty, then to the number of the problem.

The (def __ ...) part is there to help you format your code in the way 4clojure expects it. Oftentimes, you will need to write a function in there:

(def __ ;; Your solution here!
  (fn [a b]
    ,,,)
  ,,,)

Of course, in a normal project, you would use a defn, but for this special case, just write the function this way, it will be easier to copy-paste your response on 4clojure later.

Also, notice that if you toggle on the InstaREPL, any form you write in the file will be evaluated. This allows you to experiment easily with partial solutions with a very tight feedback loop.

Tips

Keep a tab open on the clojure cheatsheet. You'll need it.

Development

Build and push the docker image

If you want to build the docker image docker build -t <your docker hub handle>/local-4clj:<tag> ..

Then docker push <your docker hub handle>/local-4clj:<tag>

License