coffee_example.coffee

RP =
  setup: ->
    # construct new DOM elements
    $('<label for="filter" class="explanation">' +
      'Restrict to movies suitable for children' +
      '</label>' +
      '<input type="checkbox" id="filter"/>'
      ).insertBefore('#movies').click(RP.filter_adult)
  filter_adult: ->
    # 'this' is element that received event (checkbox)
    if $(this).is(':checked')
      $('#movies tbody tr').each(RP.hide_if_adult_row)
    else
      $('#movies tbody tr').show()
  hide_if_adult_row: ->
    $(this).hide() unless /^G|PG$/i.test($(this).find('td:nth-child(2)').text())
$(RP.setup)       # when document ready, run setup code