swift - 在 Swift 中创建字典的语法

Question

据我所知，有两种方法可以在 swift 中创建空字典

var randomDict = [Int:Int]()

或

var randomDict = Dictionary<Int, Int>()

这两者有什么区别吗？两个版本似乎都一样。

Answer 1

不，两者是一样的。来自 Apple's Book on Swift :

The type of a Swift dictionary is written in full as Dictionary<Key, Value> 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.

所以

var randomDict = [Int:Int]()

和

var randomDict = Dictionary<Int, Int>()

两者都调用创建一个空字典的初始化器，并且在不同形式下基本相同。