RxSwift: Map Operator

.map()

• Applies a supplied function to each emitted element.
• Returns an Observable that emits the result after the function has been applied.
• Transforms the elements emitted by an Observable by applying a function to each element.
• Works like Swifts standard map except it operates on observables.

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map(x -> x * 2)

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.map { response in return response.url }
.map({ (response: urls) -> [Url] in return response.urls })

// or even better...

.map { $0.url }
.map { $0.urls }

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