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Jason Anders
Treehouse Moderator 145,860 PointsCompound Operators
Could use a little confusion cleared up. At ~13:00 Gabe uses the Compound Assignment Operator =+ in some of the code that was never used as the code block this was in was just an example of a way (not the best way) to do something. There was no error in Xcode, but I'm under the impression that it should have been +=.
Was his backwards because of a typo. I searched many documentations about this and every one shows +=. So, if it was a typo, why didn't Xcode throw up a 'red stop sign'?
Can anyone shed some light.
cc: Gabe Nadel
2 Answers
Ryan Huber
13,021 PointsHere is the best that I can come up with. In objective-c the + is also a unary operator. It reads =+ as equals (+)unary (if you type it in to Xcode 7 with an objective-c project you will get the message "Use of unary operator may be intended as compound operator). Hope that helps!
jcorum
71,830 PointsTypo. I tried it in Xcode, and got the warning "Use of unary operator that may be intended a s compound assignment (+=)". This code ran:
int x = 4;
x =+ x;
NSLog(@"%i", x);
but x was logged as 4, not 8.