Cache locality
You iterate over 100,000 coordinates and sum distances. Between these two versions, what's the main reason A is noticeably faster than B?
struct P { var x, y: Double } // A: [P]
final class Q { var x, y: Double } // B: [Q]Pick one
SwiftMultiple choiceBasics
What happens when you compile this code? And if you change the same definition to class P…
#struct #class #memory-layout
Memory and ARCMultiple choiceIntro
Which statement about the stack and the heap is correct?
#struct #class
Memory and ARCShort answerBasics
In struct Order { var items: [Item]; let customer: Customer }, Item is a struct and Custo…
#struct #class
Memory and ARCShort answerAdvanced
How far is it true that "using a struct means no ARC cost"?
#struct #performance