Ruby on Rails

Hello i'm trying to make this code shorter in coffee script ... what do
you suggest? i'm new to coffee script and just want to know how i would
shorten this command

keyDownHandler = (event) ->
 selectedItem =
$(event.target).siblings(".suggestions").children(".current-suggestion")
 if selectedItem.length > 0
   if event.which is 40
     nextItem =
$(selectedItem).removeClass("current-suggestion").next()
     nextItem.addClass "current-suggestion" if nextItem.length > 0
     return
   if event.which is 38
     nextItem =
$(selectedItem).removeClass("current-suggestion").prev()
     nextItem.addClass "current-suggestion" if nextItem.length > 0
     return
   if event.which is 13 or event.which is 9
     addSuggestion(event.target)(selectedItem)
     event.preventDefault()
     return

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