how will these parameters return a Friend?

Question

The vide gives the following code
struct Friend {
    let name : String
    let age : String
    let address : String?
}
func new(friendDictionary: [String : String]) -> Friend? {
    if let name = friendDictionary["name"], let age = friendDictionary["age"] {
        let address = friendDictionary["address"]
        return Friend(name: name, age: age, address: address)
    } else {
        return nil
    }
}
Can someone please explain to me how a dictionary of string to string will return a friend>

Ryan Sady · Answer

It lies in the actual return statement within the if-let block.  You parse the dictionary values within the if-let statements, grabbing the persons name and age properties.  If those succeed and the values exists (the entire purpose of if-let statements), you return a newly constructed Friend object by passing in those two values.
```Swift
if let name = friendDictionary["name"]" , //you're grabbing the name property here
let age = friendDictionary["age"] { //you're grabbing the age property here
let address = friendDictionary["address"] //you're grabbing the address property here and because it's an optional property in the Friend struct and dictionary values always return as optionals it's ok if it's nil
return Friend(name: name, age: age, address: address) //This is where you're plugging in your name, address, and age values to return a Friend struct.
} else {
return nil //if the name and age properties within your 'friendDictionary' are nil, you return nothing
}
}

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Juan Jimenez

Juan Jimenez

how will these parameters return a Friend?

1 Answer

Ryan Sady

Ryan Sady