raffle.js.coffee file before editing it to deal with $resource. From initial Angularjs practice.

raffle.js.coffee

@RaffleCtrl = ($scope) -> # using @ before Raffle makes this visible to angularjs
# pass in scope (object used to interact with a view)
# you can set variables and functions on it
  $scope.entries = [
    {name: "Larry"}
    {name: "Brian"}
    {name: "Jennifer"}
  ]

  $scope.addEntry = ->
    $scope.entries.push($scope.newEntry)
    $scope.newEntry = {}
  # create a scope called entries which is an array and pushes all new items to the end 
  # of that array. Then resets the value after the item is pushed.

  $scope.drawWinner = ->
    pool = []
    angular.forEach $scope.entries, (entry) ->
      pool.push(entry) if !entry.winner
    # loops through all entries and pushes the entry to array 'pool' if it hasn't
    # won yet
    if pool.length > 0
      # now we only select entries from the pool, not from all entries
      entry = pool[Math.floor(Math.random()*pool.length)]
      # defines entry as a random entry in the entries array
      # does this by multiplying a random decimal number between 0 and 1 by the 
      # length of the entire array and then rounding the resulting number down
      entry.winner = true
      $scope.lastWinner = entry