some.js

  var SomeObservable = (function (__super__) {
    inherits(SomeObservable, __super__);
    function SomeObservable(source, fn) {
      this.source = source;
      this._fn = fn;
      __super__.call(this);
    }

    SomeObservable.prototype.subscribeCore = function (o) {
      return this.source.subscribe(new SomeObserver(o, this._fn, this.source));
    };

    return SomeObservable;
  }(ObservableBase));

  var SomeObserver = (function (__super__) {
    inherits(SomeObserver, __super__);

    function SomeObserver(o, fn, s) {
      this._o = o;
      this._fn = fn;
      this._s = s;
      this._i = 0;
      __super__.call(this);
    }

    SomeObserver.prototype.next = function (x) {
      var result = tryCatch(this._fn)(x, this._i++, this._s);
      if (result === errorObj) { return this._o.onError(result.e); }
      if (Boolean(result)) {
        this._o.onNext(true);
        this._o.onCompleted();
      }
    };
    SomeObserver.prototype.error = function (e) { this._o.onError(e); };
    SomeObserver.prototype.completed = function () {
      this._o.onNext(false);
      this._o.onCompleted();
    };

    return SomeObserver;
  }(AbstractObserver));

  /**
   * 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 fn = bindCallback(predicate, thisArg, 3);
    return new SomeObservable(this, fn);
  };