jQuery cached delegation blah

jquery-cachedDelegation.js

// TESSSSSSSSST
(function($) {
  $.fn.cachedDelegation = function(event, selector, callback) {
    var $context = $(this);
    $context.on(event, selector, function(e) {
      console.log('evaluating callback for ', this);
      var $target = $(this);
      var savedCallback = $(this).data('lazydelegation-callback');

      if (!savedCallback) {
        savedCallback = callback.apply(this, arguments);
        $(this).data('lazydelegation-callback', savedCallback);
      }

      if (typeof savedCallback === 'function')
        return savedCallback.apply(this, arguments);
      else
        return savedCallback
    });
  };
})(jQuery);

$(function() {
  $("form").cachedDelegation('click', 'button', function(event) {
    var button = $(this);
    var numberElem = button.find('.number');
    var number = Number(numberElem.text());

    return function(event) {
      event.preventDefault();
      number = number - 1;
      numberElem.text(number);

      if (number === 0) {
        button.prop("disabled", true);
      }
    }
  });
});