Static vs class functions/variables in Swift classes?

Question

The following code compiles in Swift 1.2:

class myClass {
    static func myMethod1() {
    }
    class func myMethod2() {
    }
    static var myVar1 = \"\"         


        

Answer 1

Testing in Swift 4 shows performance difference in simulator. I made a class with "class func" and struct with "static func" and ran them in test.

static func is:

• 20% faster without compiler optimization
• 38% faster when optimization -whole-module-optimization is enabled.

However, running the same code on iPhone 7 under iOS 10.3 shows exactly the same performance.

Here is sample project in Swift 4 for Xcode 9 if you like to test yourself https://github.com/protyagov/StructVsClassPerformance