Working with ko.computed

[brianmhunt]

It would seem that the functions this plugin provides (.map and .filter) are not added to ko.computed, however I was wondering: How difficult would it be to make such work?

Just curious.

Cheers.

[SteveSanderson]

Computed properties don't natively raise arrayChange notifications, so KO-projections wouldn't be able to detect their changes efficiently. However you can pipe an array-valued computed property into a real ko.observableArray and then use the map/filter functions on it, e.g.:

var myObservableArray = ko.observableArray(myArrayValuedComputed());
myArrayValuedComputed.subscribe(myObservableArray);

Now myObservableArray is a real observable array (so you can map/filter it), and it will be updated whenever myArrayValuedComputed changes.

[brianmhunt]

Thank you, Steve. That is a helpful suggestion. Cheers.