Getting Coffeescript to create a local variable in a FOR loop

Question

How can I get dealViewItem into the scope of the FOR loop? Currently, dealViewItem is scoped outside of it, and all my event listeners are added to the last dea

Answer 1

this is what the do keyword is for. It will run a function immediately and any local variables with the same name as one of the arguments will be passed into it, ensuring proper closure scope.

for deal in dealArray
  do (deal) ->
    dealViewItem = dealViewFactory.DealDetail(deal)
    dealViewItem.addEventListener 'click', ->
      dealCart.push(deal.dealId)
      dealViewItem.setAddedToCart()
      btnTakeDeals.setEnabled = true
    dealHolder.add(dealViewItem)

Check out the compiled version here

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do can also be used outside of loops for self executing functions.

#coffeescript
do ->
  foo = 'bar'

// javascript
(function() {
  var foo;
  return foo = bar;
})();