Implementing the reverse order of strings using Go

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This article uses Go to implement the function of string reverse order, using the simplest words to let you understand

comes with Go Tips for debugging

For example: Hello is converted to olleH

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##1. Implement the reverse order of strings

#In go, strings need to be converted into bytes to obtain values ​​based on indexes. Next, let’s look at an implementation code

The code should be clear. Below, Kaka uses diagrams to help explain

<span style="display: block; background: url(https://imgkr.cn-bj.ufileos.com/97e4eed2-a992-4976-acf0-ccb6fb34d308.png); height: 30px; width: 100%; background-size: 40px; background-repeat: no-repeat; background-color: #272822; margin-bottom: -7px; border-radius: 5px; background-position: 10px 10px;"></span><code class="hljs" style="overflow-x: auto; padding: 16px; color: #ddd; display: -webkit-box; font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; font-size: 12px; -webkit-overflow-scrolling: touch; letter-spacing: 0px; padding-top: 15px; background: #272822; border-radius: 5px;"><span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">package</span> main<br/><br/><span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">import</span> (<br/> <span class="hljs-string" style="color: #a6e22e; line-height: 26px;">"fmt"</span><br/>)<br/><br/><span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">func</span> <span class="hljs-title" style="color: #a6e22e; font-weight: bold; line-height: 26px;">stringReverse</span><span class="hljs-params" style="line-height: 26px;">()</span></span> {<br/> <span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">var</span> str = <span class="hljs-string" style="color: #a6e22e; line-height: 26px;">"Hello"</span><br/> <span class="hljs-comment" style="color: #75715e; line-height: 26px;">// 字符串转字节</span><br/> <span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">var</span> bytes []<span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">byte</span> = []<span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">byte</span>(str)<br/> <span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">for</span> i := <span class="hljs-number" style="line-height: 26px;">0</span>; i < <span class="hljs-built_in" style="color: #a6e22e; line-height: 26px;">len</span>(str)/<span class="hljs-number" style="line-height: 26px;">2</span>; i++ {<br/>  <span class="hljs-comment" style="color: #75715e; line-height: 26px;">// 定义一个变量存放从后往前的值</span><br/>  tmp := bytes[<span class="hljs-built_in" style="color: #a6e22e; line-height: 26px;">len</span>(str)-i<span class="hljs-number" style="line-height: 26px;">-1</span>]<br/>  <span class="hljs-comment" style="color: #75715e; line-height: 26px;">// 从后往前的值跟从前往后的值调换</span><br/>  bytes[<span class="hljs-built_in" style="color: #a6e22e; line-height: 26px;">len</span>(str)-i<span class="hljs-number" style="line-height: 26px;">-1</span>] = bytes[i]<br/>  <span class="hljs-comment" style="color: #75715e; line-height: 26px;">// 从前往后的值跟从后往前的值进行调换</span><br/>  bytes[i] = tmp<br/> }<br/> str = <span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">string</span>(bytes)<br/> fmt.Println(str)<br/>}<br/></code>

In this code, you can see that the maximum number of loops is to convert the string The length is except 2

In this picture we can see that in the first loop, the first string and the last string are exchanged

In the second loop, the Exchange the two values ​​with the penultimate value

This is the meaning of this code

First take out the value of the string at the end of the index

Then make the last indexed string equal to the first indexed string. That is, the first step in the above figure is to make the last value equal to the first value

and then change the first indexed string. For the value we saved in the first step, let the first value equal the last value

在go中还有好几种实现这个过程，这里咔咔在提供一种供大家参考

这种方式需要引入包strings，也是官方推荐的一种方式

<span style="display: block; background: url(https://imgkr.cn-bj.ufileos.com/97e4eed2-a992-4976-acf0-ccb6fb34d308.png); height: 30px; width: 100%; background-size: 40px; background-repeat: no-repeat; background-color: #272822; margin-bottom: -7px; border-radius: 5px; background-position: 10px 10px;"></span><code class="hljs" style="overflow-x: auto; padding: 16px; color: #ddd; display: -webkit-box; font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; font-size: 12px; -webkit-overflow-scrolling: touch; letter-spacing: 0px; padding-top: 15px; background: #272822; border-radius: 5px;"><span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">func</span> <span class="hljs-title" style="color: #a6e22e; font-weight: bold; line-height: 26px;">stringReverse1</span><span class="hljs-params" style="line-height: 26px;">()</span></span> {<br/> <span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">var</span> str = <span class="hljs-string" style="color: #a6e22e; line-height: 26px;">"hello"</span><br/> <span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">var</span> bytes []<span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">byte</span> = []<span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">byte</span>(str)<br/> <span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">var</span> build strings.Builder<br/> <span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">for</span> i := <span class="hljs-number" style="line-height: 26px;">0</span>; i < <span class="hljs-built_in" style="color: #a6e22e; line-height: 26px;">len</span>(bytes); i++ {<br/>  i2 := bytes[<span class="hljs-built_in" style="color: #a6e22e; line-height: 26px;">len</span>(bytes)-i<span class="hljs-number" style="line-height: 26px;">-1</span>]<br/>  build.WriteString(<span class="hljs-keyword" style="color: #f92672; font-weight: bold; line-height: 26px;">string</span>(i2))<br/> }<br/> s3 := build.String()<br/> fmt.Println(s3)<br/>}<br/></code>

执行俩个代码，检测是否可行

二、给你一个小技巧让你在用Go的Debug时游刃有余

假设我们想调试一下这几个值的时候，就会发现go会直接报出一个变量没有使用的错误。这种写法在PHP中是不存在报错的，这个错误就会导致go的程序编译无法通过

那么我们应该如何模拟已经使用了这个值呢！

可以使用一个底杠来解决这个问题

这时就可以使用debug来调试了我们想要得值了

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