Observable#subscribe w/ callbacks

[arcanis]

The current Observable proposal allows two different ways to call subscribe: with an observer object, or via callbacks. The later doesn't seem to be supported by Core-js.

// Subscribes to the sequence with an observer
subscribe(observer : Observer) : Subscription;

// Subscribes to the sequence with callbacks
subscribe(onNext : Function, onError? : Function, onComplete? : Function) : Subscription;

[zloirock]

Some months ago Observable proposal was updated with some breaking changes. But we can't update it in core-js right now - it's breaking changes. It will be updated in next major version.

[fbuecklers]

Is that really API breaking changes? I See it more like an API addition.
I have currently patched the core-js implementation with the following code:

var sub = Observable.prototype.subscribe;
Observable.prototype.subscribe = function(onNext, onError, onComplete) {
  if (onNext instanceof Function) {
    return sub.call(this, {
      next: onNext,
      error: onError,
      complete: onComplete
    });
  } else {
    return sub.call(this, onNext);
  }
};

Or do im miss somthing here right now?

[zloirock]

For example, in Observable#forEach - it's just removed.

[zloirock]

Added to v3 branch.