swiftdeferred

'return' cannot transfer control out of a defer statement

func someone() -> String {
    defer {
        return "World"
    }
    return "Hello"
}

someone()

for above snippet of code its throwing error "'return' cannot transfer control out of a defer statement" so what is the reason behind it?

Solution

    1. Returning more than one value is not allowed, regardless of whether you try to do that in a defer statement or not.

    2. Whatever you do to mutate a return value in a defer statement, that's not accessible via a return. It happens afterward.

    func someone() -> String {
  var `return` = "Hello"

  defer {
    `return` += "World"
  }

  return `return`
}

someone() // Hello