What order are knockout js observable extensions executed?

Question

At the bottom of the knockoutjs docs for extending observables it states...

More than one extender can be applied in a single call to the .extend method of a

Answer 1

If the order is important, you can call extend multiple times:

this.firstName = ko.observable(first)
    .extend({ required: "Please enter a first name" })
    .extend({ logChange: "first name" });

That being said, browsers generally process an object's properties in the same order they were defined. Thus your original method will have the same effect as this one.