Swift

Introduction In Swift, classes, closures, and actors all reference types. ‘Reference type’ is instance that shares a single copy of data. Assigning a reference type to a constant or variable, or passing it into a function or method, it is always a reference to a shared instance that is assigned or passed in. Example You can pass your property value by sharing the same address in memory. // Reference type example class Storage { var data = “data-example” } var storage = Storage() print("\(storage.data)") // prints "data-example" print("storage address:", Unmanaged.passUnretained(storage).toOpaque()) var copiedStorage = storage copiedStorage.data = “new-data” print("\(storage.data), \(copiedStorage.data)") // prints "new-data, new-data" print("copiedStorage address:", Unmanaged.passUnretained(copiedStorage).toOpaque()) ...