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https://docs.swift.org/swift-book/LanguageGuide/Closures.html Closures — The Swift Programming Language (Swift 5.6) Closures Closures are self-contained blocks of functionality that can be passed around and used in your code. Closures in Swift are similar to blocks in C and Objective-C and to lambdas in other programming languages. Closures can capture and store referen docs.swift.org 3. Capturi..