Re: help with lua style and syntax

[Martijn van Buul <martijn.van.buul@...>]

On 10/18/2012 3:43 PM, David Collier wrote:

> well I'm finding myself writing:
>
>      do
> 	    local localRs485SerialInstanceOpened
> 	    localRs485SerialInstanceOpened,  localRs485SerialInstance
>              = openSerialInstance(localRs485DeviceName)
> 	    if not localRs485SerialInstanceOpened
> 	    then
> 	        print("program exiting - can't open local RS485 serial port "
>                     ..localRs485DeviceName)
> 	        return
> 	    end
>      end
>
> when I could write
>
>      if( not( opened, localRs485SerialInstance =
>                   openSerialInstance(localRs485DeviceName))
>      then
>          print("program exiting - can't open local RS485 serial port
>                 "..localRs485DeviceName)
> 	        return
>      end
>
> I think the 2nd is more elegant.

I feel like your examples are contrived.

What's wrong with

localRs485SerialInstance = openSerialInstance(localRs485DeviceName)

if not localRs485SerialInstance then
   print ("...whatever...")
   return
end

Of course, this hinges on the returnvalue of openSerialInstance being sane.