Array extension to return the unique list of objects based on a given key.

Array+FilterUniqueByKey.swift

extension Array {
    func unique<T:Hashable>(by: ((Element) -> (T)))  -> [Element] {
        var set = Set<T>() //Keep unique list in a Set for fast retrieval
        var orderedArray = [Element]() //Keeping the unique list of elements but ordered
        for value in self {
            if !set.contains(by(value)) {
                set.insert(by(value))
                orderedArray.append(value)
            }
        }
        
        return orderedArray
    }
}

Usage Example...
let uniqueBasedOnName = results.unique{$0.name}