Advanced Swift: Values and References · Mutation of self |

This is a companion discussion topic for the original entry at

you said in all the 6 steps, “didSet” of pointValues is called , but its not getting called when you did “pv1.x = 50” . Since the array(pointValues) contains the copy of pv1, “didSet” shouldn’t get called when we mutate pv1. Isn’t that the correct behaviour ?

Hi! Thanks. Yes, I think you caught me in a misspeak. Oops. As you correctly surmised, pv1 is an independent copy outside of the array so array’s didSet doesn’t get called. The point that I was trying to (inarticulately) make is that if you dive into the array with a subscript and modify a value, did set gets trigger where this doesn’t happen with reference types inside the value typed array. There is no detection of the element mutation.

Thanks for the correction!

Thank you so much for the reply @rayfix