fib.coffee

f = (n) ->
    if n is 0
        0
    else if n is 1
        1
    else
        f(n-1) + f(n-2)

process.on 'message', (input) ->
    output = f(input)
    process.send output

module.exports = f

renderer.coffee

fork = require('child_process').fork
fibCp = fork(__dirname + '/fib')

fibCp.on 'message', (result) ->
    console.log result
    
$ ->
    $('#fib-start').click ->
        fibCp.send 45