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 always create an extension that uses NSArray's indexOfObject, e.g:

extension Array {
    func indexOfObject(object:AnyObject) -> Int? {
        return (self as NSArray).indexOfObject(object)
    }
}

You can specify that your array items can be compared with the constraint, then you can cast your object into T and compare them, e.g:

extension Array {
    func indexOfObject(o:T) -> Int? {
        if self.count > 0 {
            for (idx, objectToCompare) in enumerate(self) {
                let to = objectToCompare as T
                if o == to {
                    return idx
                }
            }
        }

        return nil
    }
}