Class using Singleton

FeaturedTopics.swift

final class FeaturedTopics {
    private var topics: [String: Any] = [:]
    
    static let shared = FeaturedTopics()
    
    private init() {}
    
    subscript(key: String) -> Any? {
        get {
            return topics[key]
        }
        set {
            topics[key] = newValue
        }
    }
    
    func reset() {
        topics.removeAll()
    }
}