Difference in value and reference type property setters

SwiftSetterTest.playground

public struct MyValueType {
    
    public var name: String = "My name"
    
    mutating func update(name newName: String) {
        name = newName
    }
    
}

public class MyReferenceType {
    
    public var name: String = "My name"
    
    public func update(name newName: String) {
        name = newName
    }
    
}

public class MyClass {
    
    private var _myValueType = MyValueType()
    public var myValueType: MyValueType {
        get {
            return _myValueType
        }
        set {
            _myValueType = newValue
        }
    }
    
    private var _myReferenceType = MyReferenceType()
    public var myReferenceType: MyReferenceType {
        get {
            return _myReferenceType
        }
        set {
            _myReferenceType = newValue
        }
    }
    
    //Array is a value type so let's test the concept above
    private var _names = [String]()
    public var names: [String] {
        get {
            return _names
        }
        set {
            _names = newValue
        }
    }
    
}


let myClass = MyClass()

myClass.myReferenceType = MyReferenceType()
myClass.myReferenceType.name = "some name"
myClass.myReferenceType.update(name: "some other name")

myClass.myValueType = MyValueType(name: "initial name")
myClass.myValueType.name = "some name"
myClass.myValueType.update(name: "some other name")

myClass.names = ["c", "b"]
myClass.names.append("a")