将元素添加到 Swift 中的数组 [英] Add an element to an array in Swift

问题描述

假设我有一个数组，例如:

Suppose I have an array, for example:

var myArray = ["Steve", "Bill", "Linus", "Bret"]

然后我想将一个元素推送/附加到所述数组的末尾，以获得:

And later I want to push/append an element to the end of said array, to get:

[史蒂夫"、比尔"、莱纳斯"、布雷特"、蒂姆"]

我应该使用什么方法?

如果我想在数组的前面添加一个元素呢?是否有一个恒定的时间unshift?

And what about the case where I want to add an element to the front of the array? Is there a constant time unshift?

推荐答案

从 Swift 3/4/5 开始，这是按如下方式完成的.

As of Swift 3 / 4 / 5, this is done as follows.

在数组末尾添加一个新元素.

To add a new element to the end of an Array.

anArray.append("This String")

将不同的数组附加到数组的末尾.

To append a different Array to the end of your Array.

anArray += ["Moar", "Strings"]
anArray.append(contentsOf: ["Moar", "Strings"])

在数组中插入一个新元素.

To insert a new element into your Array.

anArray.insert("This String", at: 0)

将不同数组的内容插入到您的数组中.

To insert the contents of a different Array into your Array.

anArray.insert(contentsOf: ["Moar", "Strings"], at: 0)

更多信息可以在Swift 编程语言"，从第 110 页开始.

More information can be found in the "Collection Types" chapter of "The Swift Programming Language", starting on page 110.

这篇关于将元素添加到 Swift 中的数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！