Xcode Swift check if array contains object

Question

I have this array :

  var preferiti : [ModalHomeLine!] = []

I want to check if the array contains the same object.

if the object exists {

} else {
  var addPrf = ModalHomeLine(titolo: nomeLinea, link: linkNumeroLinea, immagine : immagine, numero : titoloLinea)
  preferiti.append(addPrf)
}

Which object are you referring to by "the same object"? Are you wanting to check for duplicate objects? — oltman, Feb 19 '15 at 19:47
So you have something like this: `var myArray = [1, 2, 3]` and you would like to check if a number, say, 5 exists? — Cesare, Feb 19 '15 at 20:15

score 8 · Answer 1 · answered Feb 19 '15 at 19:50

8

Swift has a generic contains function:

contains([1,2,3,4],0) -> false
contains([1,2,3,4],3) -> true

answered Feb 19 '15 at 19:50

erdekhayser

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how to use it in my case ? – Massimiliano Allegretti Feb 19 '15 at 20:11
@MassimilianoAllegretti Your code would say `if !contains(perferiti, oggetto){ preferiti.append(addPrf) }` – erdekhayser Feb 19 '15 at 20:14

oltman · Accepted Answer · 2015-06-26T04:08:56.037

So it sounds like you want an array without duplicate objects. In cases like this, a set is what you want. Surprisingly, Swift doesn't have a set, so you can either create your own or use NSSet, which would look something like this:

let myset = NSMutableSet()
myset.addObject("a") // ["a"]
myset.addObject("b") // ["a", "b"]
myset.addObject("c") // ["a", "b", "c"]
myset.addObject("a") // ["a", "b", "c"] NOTE: this doesn't do anything because "a" is already in the set.

UPDATE:

Swift 1.2 added a set type! Now you can do something like

let mySet = Set<String>()
mySet.insert("a") // ["a"]
mySet.insert("b") // ["a", "b"]
mySet.insert("c") // ["a", "b", "c"]
mySet.insert("a") // ["a", "b", "c"] NOTE: this doesn't do anything because "a" is already in the set.

Xcode Swift check if array contains object

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