How to check if an element is in an array

Question

In Swift, how can I check if an element exists in an array? Xcode does not have any suggestions for contain, include, or has, and a qu

Answer 1

Use this extension:

extension Array {
    func contains(obj: T) -> Bool {
        return self.filter({$0 as? T == obj}).count > 0
    }
}

Use as:

array.contains(1)

Updated for Swift 2/3

Note that as of Swift 3 (or even 2), the extension is no longer necessary as the global contains function has been made into a pair of extension method on Array, which allow you to do either of:

let a = [ 1, 2, 3, 4 ]

a.contains(2)           // => true, only usable if Element : Equatable

a.contains { $0 < 1 }   // => false