swift3 陣列、字典給予空值

創建一個空陣列或者字典，使用初始化語法。

To create an empty array or dictionary, use the initializer syntax.

let emptyArray = [String]()

let emptyDictionary = [String: Float]()

 

如果型態資訊可以被推斷出來，你可以用[]和[:]來創建空陣列和空字典——就像你宣告變數或者給函式傳參數的時候一樣。

If type information can be inferred, you can write an empty array as `[]` and an empty dictionary as `[:]`—for example, when you set a new value for a variable or pass an argument to a function.

shoppingList = []

occupations = [:]