knockout.js + CoffeeScript learn.knockoutjs.com: Introduction

view.html

<p>First name: <strong data-bind="text: firstName">Bert</strong></p>
<p>Last name: <strong data-bind="text: lastName">Bertington</strong></p>

<p>First name: <input data-bind="value: firstName" /></p>
<p>Last name: <input data-bind="value: lastName" /></p>

<p>Full name: <strong data-bind="text: fullName"></strong></p>

<button data-bind="click: capitalizeLastName">Go caps</button>

viewmodel.js.coffee

$ ->
  AppViewModel = ->
    @firstName = ko.observable("Bert")
    @lastName = ko.observable("Bertington")

    @fullName = ko.computed(
      -> "#{@firstName()} #{@lastName()}"
      @
    )

    @capitalizeLastName = ->
      currentVal = @lastName();
      @lastName currentVal.toUpperCase()
      return

    return

  ko.applyBindings(new AppViewModel())