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swift2 - Swift: guard let vs if let - Stack Overflow The Swift Docs on Control Flow explain the idea behind that: Using a guard statement for requirements improves the readability of your code, compared to doing the same check with an if statement
swift - What does Fatal error: Unexpectedly found nil while unwrapping . . . Why did I get “ Fatal error: Unexpectedly found nil while unwrapping an Optional value ”? In order to access an optional’s value (if it has one at all), you need to unwrap it An optional value can be unwrapped safely or forcibly If you force-unwrap an optional, and it didn't have a value, your program will crash with the above message Xcode will show you the crash by highlighting a