Swift switch statement for matching substrings of a String

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I had a similar problem today and realized this question hasn’t been updated since Swift 1! Here’s how I solved it in Swift 4:

switch self.descriptionWeather.description {
case let str where str.contains("Clear"):
    print("clear")
case let str where str.contains("rain"):
    print("rain")
case let str where str.contains("broken clouds"):
    print("broken clouds")
default:
    break
}

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