Making sure I am accepting a single parameter in my function with correct argument labels.

Hi Michael,

You have a few problems in your code:

First, your external argument name is 'For' but the task wanted 'for'.

Next, you have listed your types in all-lowercase, but Swift types have capitalised first letters.

Next, your variables are scoped to within the switch statement only. To make them available to your return statement you need to define them before the switch statement and then set their values within the switch statement, such as in the following example:

let (left, right): (Int, Int) // declare the names
switch input_value {
    case "foo" : (left, right) = (1, 2); // set the value
    case "bar": (left, right) = (3, 4);
    default: (left, right) = (5, 6)
}
return (left, right) // return the value

Note that I've used constants instead of variables because the value will never change once it is set within the function. Using let instead of var when the value is not going to be mutated is preferred (for performance reasons) and Xcode will emit a warning when you've used var for code where the value is not mutated.

Next your tuples are formatted incorrectly, they should be enclosed in parens and comma separated, you've left off the parens and used semicolons as separators (the semicolons should only be used to separate the case statements)

You might find that building up your code in Xcode's Playground before copy-pasting it into the challenge workspace might help you as Xcode will point out a lot of syntax errors as you are writing them.

Hope this helps,

Alex