text:    /**
     *  Repeats source as long as condition holds emulating a while loop.
     * There is an alias for this method called 'whileDo' for browsers <IE9
     *
     * @param {Function} condition The condition which determines if the source will be repeated.
     * @param {Observable} source The observable sequence that will be run if the condition function returns true.
     * @returns {Observable} An observable sequence which is repeated as long as the condition holds.
     */
    var observableWhileDo = Observable['while'] = Observable.whileDo = function (condition, source) {
      isPromise(source) && (source = observableFromPromise(source));
      return enumerableWhile(condition, source).concat();
    };
  