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                ## 控制流(Control Flow) 推薦循環使用`for-in`表達式,而不使用`for-condition-increment`表達式。 推薦做法: ~~~ for _ in 0..<3 { println("Hello three times") } for (index, person) in enumerate(attendeeList) { println("\(person) is at position #\(index)") } ~~~ 不推薦做法: ~~~ for var i = 0; i < 3; i++ { println("Hello three times") } for var i = 0; i < attendeeList.count; i++ { let person = attendeeList[i] println("\(person) is at position #\(i)") } ~~~
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