Swift arrays and contains, how to determine if a collection contains an object or value?

Question

I'm at it again with swift arrays and containsObject provided by NSArray only!

I bridge the swift array to NSArray to do that contains:

extension Array {     func contains(object:AnyObject!) -> Bool {         if(self.isEmpty) {             return false         }         let array: NSArray = self.bridgeToObjectiveC();         return array.containsObject(object)     } } 

it works fine in general but as soon as I put a String! in an array of type String, it crashes. Even though containsObject does take a AnyObject!

        var str : String! = "bla"         var c = Array<String>();         c.append(str)         println(c.contains(str)) 

declaring a String! array also doesn't help

        var str : String! = "bla"         var c = Array<String!>();         c.append(str)         println(c.contains(str)) 

BUT the same without ! works fine

        var str : String = "bla"         var c = Array<String>();         c.append(str)         println(c.contains(str)) 

SO how do I explicitly wrap stuff? I don't really see why I'd have to explicitly wrap it only so it is right unwrapped but that's what it looks like.

Answer 1

Swift 1:

let array = ["1", "2", "3"] let contained = contains(array, "2") println(contained ? "yes" : "no") 

Swift 2, 3, 4:

let array = ["1", "2", "3"] let contained = array.contains("2") print(contained ? "yes" : "no")