/**
   * Determines whether any element of an observable sequence satisfies a condition if present, else if any items are in the sequence.
   * @param {Function} [predicate] A function to test each element for a condition.
   * @returns {Observable} An observable sequence containing a single element determining whether any elements in the source sequence pass the test in the specified predicate if given, else if any items are in the sequence.
   */
  observableProto.some = function (predicate, thisArg) {
    var source = this;
    return predicate ?
      source.filter(predicate, thisArg).some() :
      new AnonymousObservable(function (observer) {
        return source.subscribe(function () {
          observer.onNext(true);
          observer.onCompleted();
        }, function (e) { observer.onError(e); }, function () {
          observer.onNext(false);
          observer.onCompleted();
        });
      }, source);
  };

  /** @deprecated use #some instead */
  observableProto.any = function () {
    //deprecate('any', 'some');
    return this.some.apply(this, arguments);
  };