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.
Command Block. Command Blocks are used to issue commands when activated. This usually occurs by some sort of switch or pressure plate with a Red Stone power source. Command Blocks can be accessed in creative mode and only by those with permission to use them. They can be activated by anyone in game that steps on, or flips the switch that controls it's commands.