jQuery conditional deferred rejection and resolution based on boolean

cond.js

$.Deferred = (function (baseDeferred) {
  var slicer = [].slice;

  var cond = function (truthy) {
    return this[truthy ? 'resolve' : 'reject'].apply(this, slicer.call(arguments, 1));
  };

  return function() {
    var dfd = baseDeferred.apply(this, arguments);
    dfd.cond = cond;
    return dfd;
  };

})($.Deferred);