Swift Track Exercise: Word Search

Programming Swift
1

The required function returns WordLocation. But there is no explanation or definition of this type. Here is one of the provided test code:

let grid = ["clojurermt"]
    let words = ["clojure"]
    var expected = [String: WordLocation?]()
    expected["clojure"] = WordLocation(
      start: ["column": 1, "row": 1],
      end: ["column": 7, "row": 1]
    )

Is this the actual test being carried out?

After reviewing some of the Community Solutions, I realized that we need to use the nested type WordLocation.Location to specify the row and column, e.g.

WordLocation(
      start: WordLocation.Location(row: r1, column: c1), 
      end: WordLocation.Location(row: r2 column: c2)
    )

So, are the sample tests provided in the Exercise page out of date?

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EDIT: Okay, I read the error message more carefully. It stated

error: cannot convert value of type '[String : Int]' to expected argument type 'WordLocation.Location'41 |     42 |     return WordLocation(43 |        start: ["column": c0+1, "row": r0+1],

when I ran code with

WordLocation(
       start: ["column": c0+1, "row": r0+1],
        end: ["column": endCol + 1, "row": endRow + 1]
    )

I guess I should have deduced that I need to use WordLocation.Location, but still, it would be nicer if there’s some discussion on the return type WordLocation.

2

Hi, @rwctwo!

But there is no explanation or definition of this type.

The definition could be found in the editor next to WordSearch file.
image

I think adding a note in the description about where to find this definition would be helpful.

Is this the actual test being carried out?

Yes, everything visible in Tests tab are real tests.

3

Ahhh. I didn’t see that tab!! Thank you.

On my second question, given that WordLocation definition, how does the test routine such as

let grid = ["clojurermt"]
let words = ["clojure"]
var expected = [String: WordLocation?]()
expected["clojure"] = WordLocation(
  start: ["column": 1, "row": 1],
  end: ["column": 7, "row": 1]
)

even compile? You will get this error.

Cannot convert value of type '[String : Int]' to expected argument type 'WordLocation.Location'
4

You are right, this specific initializer is not visible and available in the editor. It’s added specifically for testing purposes as a part of the test package and isn’t meant to be visible in the editor — it’s just a helper used to initialize WordLocation with a specific test data format.

5

Okay, I got it. Thank you for your reply.