Knockout was developed and is maintained as an open source project by Steve Sanderson.
Conditioning Knockout Observables: reject values
Wouldn’t it be nice if we could restrict the value written to a Knockout observable? Some values might mess up your model completely while others just don’t make sense. How would one create a conditioned observable that rejects invalid values? It turns out that conditioning an observable is not so hard.
Subscribe to all changes of an entire Knockout ViewModel
Knockout is amazing. It is fast and intuitive. I use the subscribe function a lot, but I found myself lacking a general subscribe that allows me to track the changes of an entire ViewModel, so I created one myself that even supports unsubscribe and throttling.