Simple fun with Closures

So closures are self contained blocks of functionality which can be passed around and reused in various parts of your code.
Closures are similar to lambda's in other languages..

A typical use case for employing closures is in iOS Grand Central Dispatch
You can find a more detailed explanation here
https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/Closures.html#//apple_ref/doc/uid/TP40014097-CH11-ID94

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