The code should be always readable, no matter how expert is the reader would be. The only exception is when the code itself must be small like when your code will be run on a target with extreamly limited resources (like a smart card chipset or an IOT device for example)

This wil crash on passing 0

Clever! but can cause performance hit and also not works in reality where something other than Braces involves.

What was your code?

Best use of the native APIs. Very clever

The task wanted to "Store" the totalGoals in a separate variable. Computed properties does not store anything

This way you can even calculate the grade for any number of scores without any change in the existing tests!
Sounds cool right?

The test case is nonsense and tests nothing

Sorry @Chrono79. I'm new to the community.
This issue belongs to Swift as @ogryzek said.