ES6 standard has been out for YEARS, yet the Khan lessons are still teaching old technology. We don't use VAR any more, we use LET. This is a fundamental change to how people code JS in current year. We haven't used VAR is many many years!
This has been requested a number of times now, but I think it is falling on deaf ears.
I would create the course myself...but I am a total n00b, and am in no position to teach JS.
Khan needs to take a serious look at updating their JS courses. I think this is very important. Can someone please run this up the ladder at Khan? Thanks for listening.