Missing expression error

ID:2256292
 
Jun 9 2017, 8:30 pm
(See the best response by Kaiochao.)
Code:
grabbee.liftlb -= (drainlift = grabbee.liftlb / 20)
            grabbee.health -= (drainhealth = grabbee.health / 10)


Problem description:
The code above has a missing expression error on both lines.
I recieved it as a help understanding a further coding that i'll display below.

mob/skills/verb/Bio_Extract()
    set category="Abilities"
    set name="Bio Extract"
    grabbee = locate(/mob) in get_step(usr,dir)
    if(grabbee)
        var/repeat = 26, drainlift, drainhealth
        view() << "[usr] is absorbing [grabbee]'s Bio Extract!"
        while(repeat--)
            if(!grabbee)
                return
            grabbee.liftlb -= (drainlift = grabbee.liftlb / 20)
            grabbee.health -= (drainhealth = grabbee.health / 10)
            usr.liftlb += drainlift
            usr.health += drainhealth
            if(grabbee.health <= 1000)
                grabbee.Death()
            sleep(350)


Does anyone know what the missing expression can be? I've tried a few things but im stumped for ideas and humbly come for advice ^_^ (>^-^)>
Jun 9 2017, 8:43 pm
"drainhealth = " is not valid (same with drainlift)

If you want to do that you'd do something like:

var
    drainlift = (grabbee.liftlb/20)
    drainhealth = (grabbeee.health/10)

grabbee.liftlb -= drainlift
usr.liftlb += drainlift
grabbee.health -= drainhealth
usr.health += drainhealth
Jun 9 2017, 8:46 pm
In response to Nadrew
Best response
= is an actual operator in 511, which is what the author of this code (Ter13) is using, but maybe not what LiquidWhip is using.

I recommend updating to the latest version of BYOND... in general.
Jun 11 2017, 9:31 am
"drainhealth = " is not valid (same with drainlift)

It is valid.
Jun 11 2017, 1:06 pm
It is now, yeah, my bad. However, that makes for some really hard to read code, so I'm not sure if I'd do that over the other way purely for the sake of readability later on.
Jun 12 2017, 5:44 am
Thanks guys. I can't begin to tell you how much i appreciate you. I managed to pull it together and make it work.