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iOS Object-Oriented Swift 2.0 Classes Classes with Custom Types

Jacob Horn
Jacob Horn
9,255 Points
Posted by Jacob Horn
Jacob Horn
9,255 Points

error: missing argument for parameter 'longitude' in call self.location = Location...

I believe I have a call for longitude along with latitude here, am I missing something or is a syntax error tripping me up? Thanks for the help!

classes.swift 
struct Location {
    let latitude: Double
    let longitude: Double
}

class Business {
let name: String
let location: Location

init (name: String, latitude: Double, longitude: Double) {

self.name = name
self.location = Location(latitude: Double, longitude: Double)
  }
}

let someBusiness = Business(name: "Apple", latitude: 2.12, longitude: 3.23)

2 Answers

Nathan Tallack
Nathan Tallack
22,160 Points
Nathan Tallack
Nathan Tallack
22,160 Points

Close. Take a look at your code with some changes and comments below.

struct Location {
    let latitude: Double
    let longitude: Double
}

class Business {
    let name: String
    let location: Location

    // If you want to pass in the parameter name for the first parameter as you have
    // then you need to give it an external name as it is not used for the very first
    // paramater by default, so i have put name here as an external parameter for you.
    init (name name: String, latitude: Double, longitude: Double) {
        self.name = name
        // Here we are passing in the parameter's from the init function along with the
        // property names for the struct.  So I replaced the parameter type with the
        // names for the parameters that you are using in the init method declaration above.
        self.location = Location(latitude: latitude, longitude: longitude)
    }
}

let someBusiness = Business(name: "Apple", latitude: 2.12, longitude: 3.23)
Nathan Tallack
Nathan Tallack
22,160 Points
Nathan Tallack
Nathan Tallack
22,160 Points

To help out, below is an alternate version of your code that is a little easier to understand. :)

struct Location {
    let latitude: Double
    let longitude: Double
}

class Business {
    let name: String
    let location: Location

    init (name: String, lat: Double, long: Double) {
        self.name = name
        self.location = Location(latitude: lat, longitude: long)
    }
}

let someBusiness = Business("Apple", latitude: 2.12, longitude: 3.23)
Jacob Horn
Jacob Horn
9,255 Points
Jacob Horn
Jacob Horn
9,255 Points

Nathan saves the day! Appreciate the assistance :)