swift - 在 Swift 中创建新字典 - 何时使用哪种方法。

Question

我看到可以按如下方式在 swift 中创建字典

var dict1 = [String: Int]()
var dict2 = Dictionary<String, Int>()

然后正常使用它。什么时候应该使用哪种创建字典的方法？

Answer 1

苹果出品的书《The Swift Programming Language》说

The type of a Swift dictionary is written in full as Dictionary<Key, Value>, where Key is the type of value that can be used as a dictionary key, and Value is the type of value that the dictionary stores for those keys.

You can also write the type of a dictionary in shorthand form as [Key: Value]. Although the two forms are functionally identical, the shorthand form is preferred and is used throughout this guide when referring to the type of a dictionary.

所以看起来简写形式是首选。可能是因为它看起来更干净一些。