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iOS Swift Closures Closures in iOS Using a Closure

How to get network code to run

Not a question, but a suggestion. If you want this network code to run in a playground, add the following code to the top of your playground file:

import XCPlayground
XCPSetExecutionShouldContinueIndefinitely()

...and put something like println(response.description) inside the completionHandler callback/closure.