Whats_new_swift_5.3

Swift 5.3 Features

1. Multi-pattern catch clauses

    enum TemperatureError: Error {
        case tooCold, tooHot
    }
   

2. Multiple trailing closures

    var body: some View {
        Button(action: {
            self.showOptions.toggle()
        }) {
            Image(systemName: "gear")
        }
    }  ///Can now be written as this:
    var body: some View {
        Button {
            self.showOptions.toggle()
        } label: {
            Image(systemName: "gear")
        }
    }
   

3. Synthesized Comparable conformance for enums

    enum Size: Comparable {
        case small
        case medium
        case large
        case extraLarge
    }
       
    let shirtSize = Size.small
    let personSize = Size.large
           
    if shirtSize < personSize {
        print("That shirt is too small")
    }
   

4. self is no longer required in many places Example: inside closure.

5. Type-Based Program Entry Points
6. where clauses on contextually generic declarations
7. Enum cases as protocol witnesses
8. Refined didSet Semantics
9. A new Float16 type
10. Swift Package Manager gains binary dependencies, resources, and more