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this only works cause uses a named return type. If his variable would be called sum1 it would return nothing.
Really interesting) I've never seen that we can just return w/out specifying the variable to return
Have you tested any of your claims? https://go.dev/play/p/596Wj16Phzj
How?
The newWord variable isn't needed.
The explicit cast also isn't needed, and it is implicit from the defined return type.
The contents of the string is irrelevant.
This comment is hidden because it contains spoiler information about the solution
I did that in my solution
to make it even shorter you could replace
sum = sum + numwith
sum += numthis shows a proper understanding of strings and runes in go