Closure are important elements of swift programming. They help with dynamic variables as well as completion blocks (through the use of using Escaping Closures). Closures in Swift are similar to blocks in C and Objective-C and to lambdas in other programming languages
What are Closures?
Closures are self-contained blocks of functionality that can be passed around and used in your code. Closures are particularly useful when you work with functions or methods that take functions as one or more of their arguments
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