Swift idiomatic error checking

Question

Let\'s say that you have a function like this:

func getSomething(error: NSErrorPointer) -> Something

and you typically use it this way:<

Answer 1

if a function returns an optional value i.e

func someFunc(someVar: String) -> NSData? {
  // some code
}

(the optional means that it can return a nil) then error checking is pretty simple

if let data = someFunc("someString") {
  // this means there was NO error as the function didn't return a nil
}
else {
  // This means there was an error
}

This video is a pretty good reference for error checking and handling in swift https://youtu.be/m8szaLqHVDs