Value and reference type in Swift

value-reference.swift

import UIKit

var str = "Hello, playground"

var a = 1
var b = a

b = b + 1
/// Value of `a` doesn't change when the value of `b` changed. This is the default behaviour of Value types
print(a)
print(b)

class Person {
    var name: String
    
    init(name: String) {
        self.name = name
    }
}

var p_a = Person(name: "Peter")
var p_b = p_a

p_b.name = "Amos"

/// Whoops. The name of `p_a` has been change as well, when changing the name of `p_b`. That's the side effect of using Reference types. With that Swift type the actual variable only holding the memory address (reference) to the object.
print(p_a.name)
print(p_b.name)