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.
Useful Commands to Use. If you have ever played in a Minecraft multiplayer server before, you may be familiar with commands such as /warp or /spawn and things like that. As an admin, you can do lots of things. The Vanilla servers don't offer many commands, but Bukkit supports all sorts of them in the form of plugins. Since this guide is based on the Vanilla server software, I will stick to some of the commands used in it.