在 Swift 中创建字典的语法 [英] Syntax to create Dictionary in Swift

问题描述

据我所知有两种方法可以快速创建一个空字典

var randomDict = [Int:Int]()

或

var randomDict = Dictionary()

这两者有什么区别吗?两个版本似乎都一样.

解决方案

不，两者是一样的.摘自 Apple 的 Swift 书籍:><块引用>

Swift 字典的类型全写为 Dictionary您还可以将字典的类型以速记形式编写为 [Key: Value].尽管这两种形式在功能上是相同的，但首选简写形式.

所以

var randomDict = [Int:Int]()

和

var randomDict = Dictionary()

两者都调用了创建空字典的初始化器，并且在不同的形式上基本相同.

As far as I know there are two ways to create an empty dictionary in swift

var randomDict = [Int:Int]()

or

var randomDict = Dictionary<Int, Int>()

Is there any difference between these? Both versions seems to work just the same.

解决方案

No, both are same. From 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.

So

var randomDict = [Int:Int]()

and

var randomDict = Dictionary<Int, Int>()

both calls the initializer which creates an empty dictionary and are basically the same in different form.

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