Find Object with Property in Array

Question

is there a possibility to get an object from an array with an specific property? Or do i need to loop trough all objects in my array and check if an property is the specific

Answer 1

Edit 2016-05-05: Swift 3 will include first(where:).

In Swift 2, you can use indexOf to find the index of the first array element that matches a predicate.

let index = questionImageObjects.indexOf({$0.imageUUID == imageUUID})

This is bit faster compared to filter since it will stop after the first match. (Alternatively, you could use a lazy sequence.)

However, it's a bit annoying that you can only get the index and not the object itself. I use the following extension for convenience:

extension CollectionType {
    func find(@noescape predicate: (Self.Generator.Element) throws -> Bool) rethrows -> Self.Generator.Element? {
        return try indexOf(predicate).map({self[$0]})
    }
}

Then the following works:

questionImageObjects.find({$0.imageUUID == imageUUID})