When you are working with jQuery selectors and collections, many times you want to know if the collection actually contains the elements you wanted to select. Here's a tiny jQuery plugin that does just that.

$.fn.ensure = ->
  if (@length == 0) then throw 'Empty jQuery collection'
  this

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Use it like this:

$('input[id$=_cache]').ensure()
> Console: "Uncaught Empty jQuery collection"