The replace function accepts two parameters, the item you want to replace and the new item you want to replace it with. You are passing in the index in place of the item to replace so it doesn’t work. The replace call should be: self.locations.replace(oldLocation, new location(value)); On a side note, you shouldn’t need the … Read more
This will combine the two arrays and return the combined list. However, it is not a computed observable array (don’t know if that is even possible), but a regular computed observable. self.masterList = ko.computed(function() { return this.listA().concat(this.listB()); }, this);
The technique that you are using is the recommended approach for completely replacing the data in an observableArray. An observableArray is actually just a normal observable with extra functions added for useful array operations that act on the underlying array and trigger notifications.