'Why Functional Programming Matters' in clojure

'Why Functional Programming Matters' by John Hughes

After a quick time reading the paper, i opened up a clojure REPL and tried out the things described in the paper. The dynamic of the REPL makes it really easy to play around and try out a lot of things --- What happens if i change this, could this also work? --- This helped me a lot to understand the described concepts and ideas. It's also really nice how close the clojure syntax is to the definitions in the paper.

This repository contains pseudo code/math definitions from the paper as Clojure code. Combined with a REPL this is kind like an interactive add-on to the paper.

Content

3 Gluing Functions Together

• src/wfpm_clj_code/glue/higher_order_fn
  • lists.clj
  • trees.clj

4 Gluing Programs Together

• src/wfpm_clj_code/glue/lazy_evaluation
  • lazy_seq

How to run

It's a leiningen project. Without an IDE just run the following in the project dir:

lein repl

load a file:

(load-file "src/wfpm_clj_code/glue/higher_order_fn/trees.clj")

switch to its namespace, e.g.:

(in-ns 'wfpm-clj-code.glue.higher-order-fn.trees)

and start eval some expressions:

(fold-tree + + 0 tree)
=> 10