ios - Swift Initialize Struct with optional stored properties

Question

I'm a Swift newbie and I'm trying to get my head around using Structs with optional properties. I've done quite a bit of searching and got something that works but it feels incredibly inefficient so wondered if there's a better/more manageable way of achieving my goal.

I'd like to use Structs to represent a business but I have no idea in advance which combination of properties any specific business is likely to have. This seems to mean that I have to create an init() for every possible combination of parameters.

Here's a simplified example (I have many more properties):

import Foundation

struct Business {
    let name : String
    var web : String?
    var address: String?

    // just the business name
    init(busName: String) {
        self.name = busName
    }

    // business name + website
    init(busName: String, website: String) {
        self.name = busName
        self.web = website
    }

    // business name + address
    init(busName: String, address: String) {
        self.name = busName
        self.address = address
    }

    // business name + website + address
    init(busName: String, website: String, address: String) {
        self.name = busName
        self.web = website
        self.address = address
    }
}

I can then initialise the class like this:

Business(busName: "Dave's Cafe", website: "http://www.davescafe.com")

Business(busName: "Sarah's Brewhouse", address: "41 Acacia Ave, Smalltown")

Is there no way to create some kind of init() where the parameters are optional? If you could point me in the direction of terms or concepts to search for that would be great.

Answer 1

Use default values:

init(busName: String, website: String? = nil, address: String? = nil) {
    self.name = busName
    self.web = website
    self.address = address
}

Then you can call the init like this:

_ = Business(busName: "Foo")
_ = Business(busName: "Foo", website: "www.foo.bar")
_ = Business(busName: "Foo", address: "bar")
_ = Business(busName: "Foo", website: "www.foo.bar", address: "bar")