Use subscripting to access the value for a dictionary key. This will return an Optional: let apple: String? = companies["AAPL"]. ... <看更多>

In this Swift tutorial video we'll look at dictionaries; specifically declaration, adding and updating key / value pairs, working with count, ... ... <看更多>

naive (strong key/weak value) dictionary & (weak key/weak value) dictionary implementations in swift - GitHub ... ... <看更多>