Extensions for Swift's Dictionaries

DictionaryExtensions.swift

extension Dictionary where Value == Any {
  
    // Usage: dict.value(forKey: "age", defaultValue: 100) … works with every type!
    func value(forKey key: Key, defaultValue: @autoclosure () -> T) -> T {
        guard let value = self[key] as? T else {
            return defaultValue()
        }

        return value
    }
  
}