Get previous value of an observable in subscribe of same observable

Question

Is it possible in knockout to get the current value of an observable within a subscription to that observable, before it receives the new value?

Example:

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Answer 1

There is a way to do a subscription to the before value like this:

this.myObservable = ko.observable();
this.myObservable.subscribe(function(previousValue){
    //I'd like to get the previous value of 'myObservable' here before it's set to newValue
}, this, "beforeChange");