Yeah, Staffan. Maybe, probably?
It is correct, and I think it's not being accepted as the test isn't checking for
It's not a huge priority at the moment to improve, but I'm going to add it to the Hints above to try and help others out, and I'm 90% that it should be allowed in this case, as it's correct and in the spirit I believe of the challenge**
Thanks for posting!
** I can't remember if
+= is covered in this course, but although a different operator that
+ technically, it's really just a shortcut that equates to using
+. Couldn't easily find out with a couple searches, but I'm pretty sure it's not covered; to me, that's not overly important, and I'll keep an eye on this and may open up an issue later!