Swift

Introduction In this article, I’m going to briefly explain what closure is. Closures is self-conitained blocks of funcionality that can be passed around and used in your code. — Apple Expression: { (params) -> return value in statements } @escaping When closure is marked as escaping, it will outlive or leave the scope you passed. func response(_ completionHandler: @escaping(Result) -> Void) { completionHandler(.success) } @nonescaping By default, closures are nonescaping, meaning closure will no longer exist in memory after complete execution in the scope you have passed it to. ...

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()) ...