http://swift.gg/2016/06/22/what-to-learn-first/
https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/GuidedTour.html#//apple_ref/doc/uid/TP40014097-CH2-ID1
http://swiftcafe.io/2015/10/10/swift-daily-closure/
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