Missing Return in a Function Expected to Return 'Double'

Missing return in a function expected to return 'Double?'

Your function can be shortened a hell of a lot by taking advantage of some of the tools that’s Swift gives you. Here, take a look, this does the same thing...

func priceCheck(name: String) -> Double? {
    guard let stockAmount = stock[name],
        stockAmount > 0,
        let price = prices[name] else {
        return nil
    }

    return price
}

Error: 'Missing return in a function expected to return Int'

You also need to consider cases that do not fall in the 2 conditions. It expects you to provide a default return value.

In the first case, you had a default value of 0 being returned.

In the second case, if your frequency is neither in the first range (specified by the first if condition) nor in the second range (specified by the second if condition), you need to specify a default return value.

func isBandFM() -> Int {
        if frequency >= RadioStation.minFMFFrequency && frequency <= RadioStation.maxFMFFrequency {
            return 1 //FM
        } else if frequency >= RadioStation.minAMFFrequency && frequency <= RadioStation.maxAMFFrequency{
            return 0 //AM
        }

        return 0   // or whatever value you want to return if frequency is not within FM range or AM range
}

missing return in a function expected to return 'Double' | What to do?

The issue is that your if statement is missing an else block, the return value is not defined for the case when self == 0. You can simply change the else if branch to else, because you also want to return self for 0.

var absoluteValue: Double {
    if self < 0 {
        return self * -1
    } else {
        return self
    }
}

You can also write this as a oneliner using the ternary operator:

var absoluteValue: Double {
    return self < 0 ? self * -1 : self
}

Missing return in a function Swift

What happens if player1TotalScore is less than player2TotalScore. It falls through both if conditions and has no return value. You have to handle every case, and you're missing one here. That's why the else works, it handles both the == and the < cases.

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