Indirect Enums in Swift - iOS Tutorial (2023)

[@sruthisubramanian3583]

Thank u.it's very useful tips🙂

[@iOSAcademy]

Welcome 😊

[@Andrew-7324]

Cool, never heard about this feature

[@iOSAcademy]

Nice

[@ChristopherCricketWallace]

under the hood
behind the scene

[@iOSAcademy]

Yep

[@serjrubens]

would be also nice to see a real example of usage including concrete task preferably with any UI visualising this. otherwise how to define why do I need linked list? anyway thank you for your efforts :)

[@savagedirk9267]

I may be missing something. How do you go about accessing different nodes? Initially thought could use to set up a state machine but haven’t tumbled how to access hierarchy.

[@dsjove]

how about this...
enum LinkedListItem {
indirect case node(T, LinkedListItem? = nil)
var value: T {
switch self {
case .node(let value, let _):
return value
}
}
var next: LinkedListItem? {
switch self {
case .node(let _, let next):
return next
}
}
}
extension LinkedListItem: CustomStringConvertible where T: CustomStringConvertible {
var description: String {
var node: LinkedListItem? = self
var str = ""
while true {
str = str + node!.value.description
node = node!.next
if (node == nil) {
break
}
str = str + "->"
}
return str
}
}
typealias LinkedList = LinkedListItem?
let list = LinkedList.init(.node(9, .node(1, .node(8))))
print(list!)

[@NeneRomanovaBGC]

Why does swift keep adding these strange constructs to the language? Sure I guess you could use enum this way, but it's going to make maintaining this code confusing down the road.

[@legato3692]

Thanks for the tips !
What would be the point of a linked list with enum instead of struct ? would it be more efficient or it is just another way of achieving it ?

[@iOSAcademy]

Two differing approaches

[@robinfr93]

Seems more ugly and confusing

[@dsjove]

struct does not support indirect

[@salihtopcu]

Also, which method is better for compiling performance?

[@VictorHenrique17]

It expands the possibilities of data structures created by the language. It is not much used during daily life, but for me is by far the coolest feature form the language.

[@iOSAcademy]

Agreed

[@devayz9305]

Great, thanks

nice to know about this, but i still cant see ill be using it anywhere. Maybe path finding? but then again why would i use an enum instead a struct?

[@iOSAcademy]

Theres always multiple ways to do a single thing. Its preference

[@burgermatz]

Take that, algorithm!

[@iOSAcademy]

Lol thanks

[@indomitabletr1834]

why do I need linkedlist structure with indirect enum over normal traditional linkedlist ?

[@iOSAcademy]

Just another way to implement it.

[@indomitabletr1834]

@@iOSAcademy thank you. I will consider to implement if i need. Looking fancy 😜

[@VictorHenrique17]

​@@indomitabletr1834For structures like trees and graph, it helps a lot.

[@ryankanno2562]

Brilliant! Very cool!

[@iOSAcademy]

Thanks

[@kamertonaudiophileplayer847]

Could you add a function to insert in the list?

[@manishah92]

❤

[@iOSAcademy]

Thanks

[@chickenrei3876]

Thanks
Speech recognition in SwiftUI?
Please

[@iOSAcademy]

Coming soon

[@chickenrei3876]

You said that 3 weeks ago

[@serjrubens]

@@chickenrei3876 😅

[@movementinaction]

Cool, thanks

[@iOSAcademy]

No problem!

[@victorriurean]

nice

[@iOSAcademy]

Thanks

[@clearcut3674]

Does enum change the type to a reference one?

[@iOSAcademy]

Nope. Still value type

[@andreifokin311]

@@iOSAcademy Are you sure about it? It seems we can't calculate memory space for indirect enum during
compilation cause of recursion. So probably enum changes it type to reference?
P.S Thanks a lot for your tutorials! You're doing great!

[@Andrew-7324]

Using enums this way doesn't make sense because of value semantics. Accessing some nodes and changing them will produce copies without modifying linked list by itself.

[@ChristopherCricketWallace]

what does a recursive function to traverse this list look like?

[@iOSAcademy]

A while loop