[GettingStarted] Use canonical way of checking a string for a string
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@ -764,7 +764,7 @@ When writing elegant RxSwift/RxCocoa code, you are probably relying heavily on c
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```swift
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images = word
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.filter { $0.rangeOfString("important") != nil }
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.filter { $0.containsString("important") }
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.flatMap { word in
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return self.api.loadFlickrFeed("karate")
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.catchError { error in
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@ -777,7 +777,7 @@ If compiler reports that there is an error somewhere in this expression, I would
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```swift
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images = word
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.filter { s -> Bool in s.rangeOfString("important") != nil }
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.filter { s -> Bool in s.containsString("important") }
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.flatMap { word -> Observable<JSON> in
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return self.api.loadFlickrFeed("karate")
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.catchError { error -> Observable<JSON> in
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@ -790,7 +790,7 @@ If that doesn't work, you can continue adding more type annotations until you've
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```swift
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images = word
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.filter { (s: String) -> Bool in s.rangeOfString("important") != nil }
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.filter { (s: String) -> Bool in s.containsString("important") }
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.flatMap { (word: String) -> Observable<JSON> in
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return self.api.loadFlickrFeed("karate")
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.catchError { (error: NSError) -> Observable<JSON> in
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