Knockout includes a function called ko.isObservable() . You can call it like ko.isObservable(vm[key]) . Update from comment: Here is a function to determine if something is a computed observable: UPDATE: If you are using KO 2.1+ - then you can use ko.isComputed directly.
Command Block. The Command Block is a redstone-powered block that was made available in the 1.4 update for Minecraft. The Command Block will perform server Commands when attached to a redstone circuit. This block cannot be crafted, and only server operators are allowed to place and use them.
Download and install BlockLauncher. This is a free app that manages mod files for Minecraft PE. It is one of the only reliable ways to install mods on the Pocket Edition of Minecraft. Another possible launcher app is PocketTool, which uses mostly the same process. 1  You can find BlockLauncher on the Google Play Store.