Runtime error handling in Swift

Question

I am fully aware that Swift doesn\'t have a try/catch mechanism to catch exceptions (OK, Swift 2.0 now supports them). I also understand that many API methods return a NSError t

Answer 1

Consider using a guard statement instead of multiple if lets.

var arr = [0,1,2]
for i = 0...3 {
    Guard arr[i] != nil else {
        Continue
    }
    println(arr[i]) //oops!
}

Or instead of

if let x = some value {
    If let y = someOtherVal {
        If let z = yetanotherVal {
            Product = x * y* z
        }
    }
}

Is not nearly as neat as:

Let x = someVal
Let y = someOtherVal
Let z = yetAnotherVal

Guard x != nil,
  y != nil,
  z != nil
Else {
  Return
}

Product = x * y * z