Swift error: Missing return in a function expected to return 'String'

Question

I'm trying to add edit some code from Apple's QuestionBot. I came up with this:

func responseToQuestion(question: String) -> String {

    if question.hasPrefix("hello") {
        return "Hello"
    } else if question.hasPrefix("where") {
        return "There"
    } else if question.hasPrefix("what"){
        return "I don't know"
    }

}

But there's an error: Missing return in a function expected to return 'String'. What should I do, thanks?

Think about it: what should the function return if the question has none of the three prefixes? — Martin R
– Martin R, Commented Sep 5, 2016 at 18:07

Nazmul Hasan · Accepted Answer · 2016-09-05 18:46:23Z

3

Missing return in a function expected to return 'String'

should the function return something , because you did not set return if do not match any one question.hasPrefix()

 func responseToQuestion(question: String) -> String {

            if question.hasPrefix("hello") {
                return "Hello"
            } else if question.hasPrefix("where") {
                return "There"
            } else if question.hasPrefix("what"){
                return "I don't know"
            }
          return "something"
        }

edited Sep 5, 2016 at 18:46

answered Sep 5, 2016 at 18:41

Nazmul Hasan

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