vJASS

i wanna know what exactly is vJASS ? what it does ? where can i find it ?

http://www.wc3campaigns.net/showthread.php?t=90999

Download, read JassHelper manual.

It basically allows for more JASS things like structs and all that, that's a tutorial for that too. Also, the link TR provided tells more info like how it's a better syntax checker etc.