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null nil in Swift - Stack Overflow 8 Swift’s nil is not the same as nil in Objective-C In Objective-C, nil is a pointer to a non-existent object In Swift, nil is not a pointer—it is the absence of a value of a certain type Optionals of any type can be set to nil, not just object types NULL has no equivalent in Swift nil is also called nil in Swift Nil has no equivalent
ios - How do you create a Swift Date object? - Stack Overflow Swift has its own Date type No need to use NSDate Creating a Date and Time in Swift In Swift, dates and times are stored in a 64-bit floating point number measuring the number of seconds since the reference date of January 1, 2001 at 00:00:00 UTC This is expressed in the Date structure The following would give you the current date and time:
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