observableArray.removeAll() on empty array triggers update

[Fabian Sturm]

Hi,

I just figured out that

    self.selectedConfigurations = ko.observableArray([]);
    ...
    self.selectedConfigurations.removeAll();

triggers an update of all dependant variable even thou the array was already empty.

Is this the intended behaviour?
I now will have to wrap all the removeAll calls with:

if (self.selectedConfigurations().length > 0) {
    self.selectedConfigurations.removeAll();
}

Or is there a shorter version for that?

Thanks, Fabian

[Michael Best]

You can extend observableArray by adding to ko.observableArray.fn:

ko.observableArray.fn.myRemoveAll = function() {

    if (this.peek().length > 0) {

        this.removeAll();

    }

};

-- Michael