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What's the most idiomatic way to do some time?

Here is a piece of code I have in the fast-paced Tic Tac Toe project.

var inputTuple = readPositionsFromUser()

while inputTuple == nil {
    print()
    print("Pay attention!")
    print()
    sleep(1)
    inputTuple = readPositionsFromUser()
}

let (row, col) = inputTuple!

ReadPositionsFromUser()

prompts the user for a row and column and returns nil if he cannot parse exactly two Ints

, and those Ints

are within the Tic Tac Toe board.

I'm wondering if there is a more idiomatic way to do this, since it !

seems unnecessary on the last line; if this point of code has been reached then I know that InputTuple is non-zero, so the use !

seems silly.

EDIT: I feel like I should clarify that this is a cross-platform command line application. I don't use Cocoa or anything like that.

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1 answer


The Swift compiler may well be smart enough (when optimizing a release build) to recognize that inputTuple

there cannot be nil in the last statement.

But if you want to eliminate it anyway, you can wrap the loop in a function that returns an optional tuple. You can even use inline closure like:



let (row, col): (Int, Int) = {
    while true {
        if let inputTuple = readPositionsFromUser() { return inputTuple }
        print("\nPay attention!\n")
        sleep(1)
    }
}()

print("row=\(row) col=\(col)")
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