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Faradja Nondo
1,485 PointsCan we use a guard statement to instantiate an enum? If no why not?
enum HTTPStatusCodes: Int {
case Continue = 100
case Success = 200
case Unauthorized = 401
case Forbidden = 403
case NotFound = 404
}
let statusCode = 200
if let httpCode = HTTPStatusCodes (rawValue: statusCode) {
print(httpCode)
}
How can I use a guard statement instead on httpCode? Or is guard only to be used within an enum, struct, function or class?
1 Answer
jcorum
71,830 PointsGuard gets tricky. Here's an example that works, but it is in a function:
func returnStatusText(statusCode: Int) {
guard let httpCode = HTTPStatusCodes(rawValue: statusCode) else {
print("error")
return //return invalid outside of a func
}
print(httpCode)
}
returnStatusText(202) //prints "error"
returnStatusText(200) //prints "Success"
Apple says:
The else clause of a guard statement is required, and must either call a function marked
with the noreturn attribute or transfer program control outside the guard statement’s
enclosing scope using one of the following statements:
return
break
continue
throw
break is only allowed inside a loop, if, do, or switch.
continue is only allowed inside a loop.
throw is OK in a function, but requires the function to throw an error.