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.
Minecraft Creative Servers Servers: 2098 Creative mode allows players to destroy all blocks instantly (including normally-indestructible blocks such as bedrock) and the ability to fly. Players are given an infinite number of blocks to build with and no health or hunger bar thus rendering the player immune to all damage.