Comparing objects in an Array extension causing error in Swift

Question

I\'m trying to build an extension that adds some of the convenience functionality of NSArray/NSMutableArray to the Swift Array class, and I\'m trying to add this function:

Answer 1

You can extract the compare part to another helper function, for example

extension Array {
    func indexOfObject(object: T, equal: (T, T) -> Bool) -> Int? {

        if self.count > 0 {
            for (idx, objectToCompare) in enumerate(self) {
                if equal(object, objectToCompare) {
                    return idx
                }
            }
        }

        return nil
    }
}

let arr = [1, 2, 3]

arr.indexOfObject(3, ==) // which returns {Some 2}