* I'm working on a Chip-8 emulator. So, I'm doing fancy thing like this:

```
match command {
            0x00E0 => Ok(Command::ClearScreen),
            0x00EE => Ok(Command::Return),
            command if (command & 0xF000) == 0x1000 => Ok(Command::Jump(self.val_u12)),
            command if (command & 0xF000) == 0x2000 => Ok(Command::Call(self.val_u12)),
            command if (command & 0xF000) == 0x3000 => {
                Ok(Command::SkipIfRegVal(self.reg_x, self.val_u8))
            }
}
```

Thought maybe there is a good way to do this.