Coffeescript that didn't work for some reason, with the Javascript that did

script.coffee

# namespace jQuery
(($) ->

  # Document.ready
  $ ->

		switchColorbox = () ->
			if $(window).width() < 1000
				$.colorbox.remove()
			else
				if $.colorbox.element().length < 1
			  	$('.preview').colorbox({
			  		iframe: true,
			  		innerWidth:700,
			  		innerHeight:400,
			  	})

  	$(window).resize(() ->
  		switchColorbox()
  	)

  	switchColorbox()

		console.log 'hi'
		console.log $.colorbox.element().length < 1

) jQuery

script.js

(function($) {
	addColorbox = function() {
	 	$('.preview').colorbox({
			iframe: true,
			innerWidth:700,
			innerHeight:400
		});
	}

	switchColorbox = function() {
		if ($(window).width() < 1000) {
			$.colorbox.remove();
		} else if ($.colorbox.element().length < 1) {
			addColorbox();
		}
	}

  return $(function() {
  	switchColorbox();
  	$(window).resize(function() {
  		switchColorbox();
  	});
  });
})(jQuery);