EBCs in CoffeeScript

app.coffee

# Resolve dependencies.
EventEmitter = (require 'events').EventEmitter;
 
# Define EBCs.
class HelloWorldGenerator extends EventEmitter
  generate: ->
    this.emit 'generated', 'Hello World!'
 
class UpperCaseTransformer extends EventEmitter
  transform: (text) ->
    this.emit 'transformed', text.toUpperCase()
 
class ConsoleWriter extends EventEmitter
  write: (text) ->
    console.log text
 
# Create EBC instances.
helloWorldGenerator = new HelloWorldGenerator()
upperCaseTransformer = new UpperCaseTransformer()
consoleWriter = new ConsoleWriter()
 
# Wire up EBC instances.
helloWorldGenerator.on 'generated', (text) ->
  upperCaseTransformer.transform text
upperCaseTransformer.on 'transformed', (text) ->
  consoleWriter.write text
 
# Run application.
helloWorldGenerator.generate()