Binary operator '+' cannot be applied to operands of type '()' and 'String' error

Question

Hi. I'm getting an error on the index 1 of my code : Binary operator '+' cannot be applied to operands of type '()' and 'String'. The code block is the following

func addDance (_ sentence: String) {

    return addDance(sentence: String) + " and then we dance"

}

The instruction of the exercise I'm doing is the following : «Create a function addDance that takes a string, appends a phrase about dancing (like "and then we dance!" or "but no dancing", according to your taste), and returns the new string.

Call the addDance function passing in myPlans, and assign the result to friendPlans. »

Swift

1.6k

Posted by

Kwiky

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Answer 1

func addDance (_ sentence: String) {
    return addDance(sentence: String) + " and then we dance"
}

what @robnotyou said, plus.

There are several errors here:

when you call a func, you need to pass a parameter, not its type
so it should be

return addDance(sentence) + " and then we dance"

But, calling the func inside itself will cause infinite recursion:
- you call addDance
- this will call addDance
- which will call again addDance
- and this ad libitum, until crash

.

the error means that

addDance(sentence: String) is considered as a func (which would be different from addDance (_ sentence: String) as it has not the exact same signature : _ is missing) with no return type (that's what () means)

Posted by

Claude31

Thanks for the clarification @Claude31. Not gonna lie, coding has many things to think about to avoid making mistakes 😭

—
Kwiky
For sure. But we all learn from mistakes. Good continuation and don't forget to close the thread by marking the correct answer.

—
Claude31

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Answer 2

Perhaps you mean this?

func addDance(_ sentence: String) -> String {
    return sentence + " and then we dance"
}

Posted by

robnotyou

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Answer 3

func addDance (_ sentence: String) {
    return addDance(sentence: String) + " and then we dance"
}

what @robnotyou said, plus.

There are several errors here:

when you call a func, you need to pass a parameter, not its type
so it should be

return addDance(sentence) + " and then we dance"

But, calling the func inside itself will cause infinite recursion:
- you call addDance
- this will call addDance
- which will call again addDance
- and this ad libitum, until crash

.

the error means that

addDance(sentence: String) is considered as a func (which would be different from addDance (_ sentence: String) as it has not the exact same signature : _ is missing) with no return type (that's what () means)

Posted by

Claude31

Thanks for the clarification @Claude31. Not gonna lie, coding has many things to think about to avoid making mistakes 😭

—
Kwiky
For sure. But we all learn from mistakes. Good continuation and don't forget to close the thread by marking the correct answer.

—
Claude31

Add a Comment

Answer 4

// Define and call your function here:

func addDance (_sentence: String) {

return addDance (sentence) + " and then we go dance"

} ***getting cannot find "sentence" in scope please help. I followed what you helped him out with and still getting the same error

Posted by

dward0525

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Binary operator '+' cannot be applied to operands of type '()' and 'String' error

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