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iOS

Posted by Robert Deegan
Robert Deegan
2,848 Points

Instance method not working

Why does this return a blank for name?:

struct Person {
    let firstName: String
    let lastName: String


    func getFullName(firstName: String, lastName: String) -> String {
        let fullName = "\(firstName)" + " " + "\(lastName)"
         return "The person's full name is \(fullName)"
    }

}

let person1 = Person(firstName: "Mickey", lastName: "Mouse")

person1.getFullName()
Abraham Juliot
Abraham Juliot
47,353 Points

your function needs no parameters

1 Answer

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

Hello:

So you have a structure with a couple of properties and a function that will return a string. The reason why it's returning "blank" or it's giving you an error, it's because you are implementing a function that has parameters, and you are calling that same function without giving it arguments to fulfill those parameters.

This implementation has several small things you can change.

First thing

// Delete the parameter names

// Before
    func getFullName(firstName: String, lastName: String) -> String {
        let fullName = "\(firstName)" + " " + "\(lastName)"
         return "The person's full name is \(fullName)"
    }

// After

    func getFullName() -> String {
        let fullName = "\(firstName)" + " " + "\(lastName)"
         return "The person's full name is \(fullName)"
    }

Second thing

// Fix the interpolation 

// Before
   func getFullName() -> String {
        let fullName = "\(firstName)" + " " + "\(lastName)"
         return "The person's full name is \(fullName)"
    }


// After

    func getFullName() -> String {
        let fullName = "\(firstName)\( lastName)"
         return "The person's full name is \(fullName)"
    }

With these changes, we've made the function work, and made it a bit more simple. You may ask.. "Why did we delete the parameter names?"

Well simple.. The struct has the properties the function is going to be using to return the names, therefore you do not have to give it extra information to it.

Once you create an instance of Person, then the function can access those properties and use them as we did.

Hope you understand, if you don't please let me know..

Good luck

Robert Deegan
Robert Deegan
2,848 Points

"Well simple.. The struct has the properties the function is going to be using to return the names, therefore you do not have to give it extra information to it. Once you create an instance of Person, then the function can access those properties and use them as we did." I totally get it. Thanks so much for all the detail.

The interpolation is still a minor problem. I see how you put a space before lastName, yet I still get an output string in which the 2 names appear without a space separating them.

I really appreciate you giving time to this Rob