ARC-medium

Person.swift

class Person {
  
  let name: String

  init(name: String) {
    self.name = name
    print("\(name) is being initialized")
  }
  
  deinit {
    print("\(name) is being deinitialized")
  }
}

reference1.swift

var reference1 = Person(name: "John Appleseed")
// output: "John Appleseed is being initialized"

references2-3p1.swift

var reference2: Person?
var reference3: Person?

references2-3p2.swift

reference2 = reference1
reference3 = reference1

release.swift

reference1 = nil // reference counts = 2
reference2 = nil // reference counts = 1
reference3 = nil // reference counts = 0
// output: "John Appleseed is being deinitialized"