Here, I am fashioning a simple node project so that I can import the code for the book 'Mostly Adequate Guide to Functional Programming' into a node project and run the code in the book.
To play with the code using this project, simply run node in a terminal to open the node REPL, and then type .load index.js to load the code from the book into the REPL. Then you can play with the code from the book in the REPL.