Swift_literals.swift

import UIKit

extension Date: ExpressibleByStringLiteral {
    public init(stringLiteral value: String) {
        let formatter = DateFormatter()
        formatter.dateFormat = "dd-MM-yyyy"
        formatter.timeZone = TimeZone(secondsFromGMT: 0)
        self = formatter.date(from: value)!
    }
}

let date: Date = "09-12-2020"
print(date) // Prints: 2020-12-09 00:00:00 +0000


final class Cache<T> {
    private var store: [String: T]

    init(objects: [String: T]) {
        self.store = objects
    }

    func cache(_ object: T, forKey key: String) {
        store[key] = object
    }

func object(for key: String) -> T? {
        return store[key]
    }
}

extension Cache: ExpressibleByDictionaryLiteral {
    convenience init(dictionaryLiteral elements: (String, T)...) {
        self.init(objects: [String: T](uniqueKeysWithValues: elements))
    }
}

let cache: Cache<URL> = ["Swift": URL(string: "https://www.some.com")!]
print(cache.object(for: "Swift")!)