Node.js chat server in CoffeeScript
I’ve been checking out CoffeeScript recently. It’s really f’kin cool.
The CoffeeScript site describes it best:
CoffeeScript is a little language that compiles into JavaScript. Think of it as JavaScript’s less ostentatious kid brother — the same genes, roughly the same height, but a different sense of style.
To kick the tires a little, I converted my old Node.js chat server to use CoffeeScript instead of just vanilla JavaScript.
Check out the code below, pretty stylish little language right?
net = require('net')
Array.prototype.remove = (element) ->
for e, i in this when e is element
return this.splice(i, 1)
class Client
constructor: (stream) ->
@stream = stream
@name = null
clients = []
server = net.createServer((stream) ->
client = new Client(stream)
clients.push client
stream.setTimeout 0
stream.setEncoding "utf8"
stream.addListener('connect', ->
stream.write 'Welcome, enter your username:\n'
)
stream.addListener('data', (data) ->
if client.name is null
client.name = data.match /\S+/
stream.write('===========\n')
for c in clients when c isnt client
c.stream.write(client.name + " has joined.\n")
return
matched = data.match /^\/(.*)/
if matched and matched.length > 1
command = matched[1]
if command == 'users'
for c in clients
stream.write("- " + c.name + "\n")
else if command == 'quit'
stream.end()
return
for c in clients when c isnt client
c.stream.write(client.name + ": " + data)
)
stream.addListener('end', ->
clients.remove client
for c in clients
c.stream.write client.name+" has left.\n"
stream.end()
)
)
server.listen 7000
Also, as an extra bonus. I’ve written a CoffeeScript edit mode for jEdit to get syntax highlighting, auto-indent, completion etc. Get it here.
