CoffeeScript, 2nd Edition

Running and Compiling CoffeeScript

Like most scripting languages, CoffeeScript has a REPL (“read-eval-print loop,” a term that originated with Lisp) where you can run commands interactively. To enter the REPL, just run coffee:

$ coffee
coffee> audience = 'world'
'world'
coffee> "Hello, #{audience}!"
'Hello, world!'

To exit the REPL, press Ctrl-d.

The REPL handily shows you the output of each expression you enter. However, editing nontrivial amounts of code on the REPL is a pain. So how do we make coffee evaluate code written in our favorite text editor?

Create a file named hello.coffee with this code:

GettingStarted/hello.coffee

rl = require('readline').createInterface
  input: process.stdin
 output: process.stdout ...