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ch1/ch1-03.html
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@@ -264,7 +264,7 @@ func countLines(f *os.File, counts map[string]int) {
<p>为了使示例代码保持合理的大小，本书开始的一些示例有意简化了错误处理，显而易见的是，应该检查 <code>os.Open</code> 返回的错误值，然而，使用 <code>input.Scan</code> 读取文件过程中，不大可能出现错误，因此我们忽略了错误处理。我们会在跳过错误检查的地方做说明。5.4 节中深入介绍错误处理。</p>
<p>注意 <code>countLines</code> 函数在其声明前被调用。函数和包级别的变量（package-level entities）可以任意顺序声明，并不影响其被调用。（译注：最好还是遵循一定的规范）</p>
<p><code>map</code> 是一个由 <code>make</code> 函数创建的数据结构的引用。<code>map</code> 作为参数传递给某函数时，该函数接收这个引用的一份拷贝（copy，或译为副本），被调用函数对 <code>map</code> 底层数据结构的任何修改，调用者函数都可以通过持有的 <code>map</code> 引用看到。在我们的例子中，<code>countLines</code> 函数向 <code>counts</code> 插入的值，也会被 <code>main</code> 函数看到。（译注：类似于 C++ 里的引用传递，实际上指针是另一个指针了，但内部存的值指向同一块内存）</p>
<p><code>dup</code> 的前两个版本以&quot;流”模式读取输入，并根据需要拆分成多个行。理论上，这些程序可以处理任意数量的输入数据。还有另一个方法，就是一口气把全部输入数据读到内存中，一次分割为多行，然后处理它们。下面这个版本，<code>dup3</code>，就是这么操作的。这个例子引入了 <code>ReadFile</code> 函数（来自于<code>io/ioutil</code>包），其读取指定文件的全部内容，<code>strings.Split</code> 函数把字符串分割成子串的切片。（<code>Split</code> 的作用与前文提到的 <code>strings.Join</code> 相反。）</p>
<p><code>dup</code> 的前两个版本以&quot;流”模式读取输入，并根据需要拆分成多个行。理论上，这些程序可以处理任意数量的输入数据。还有另一个方法，就是一口气把全部输入数据读到内存中，一次分割为多行，然后处理它们。下面这个版本，<code>dup3</code>，就是这么操作的。这个例子引入了 <code>ReadFile</code> 函数（来自于<code>io/ioutil</code>包），其读取指定文件的全部内容，<code>strings.Split</code> 函数把字符串分割成子串的切片。（<code>Split</code> 的作用与前文提到的 <code>strings.Join</code> 相反。请注意如果在Windows下测试注意换行是否为\r\n，否则最后一行是否有空行将会影响结果。）</p>
<p>我们略微简化了 <code>dup3</code>。首先，由于 <code>ReadFile</code> 函数需要文件名作为参数，因此只读指定文件，不读标准输入。其次，由于行计数代码只在一处用到，故将其移回 <code>main</code> 函数。</p>
<p><u><i>gopl.io/ch1/dup3</i></u></p>
<pre><code class="language-go">package main
print.html
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@@ -489,7 +489,7 @@ func countLines(f *os.File, counts map[string]int) {
<p>为了使示例代码保持合理的大小，本书开始的一些示例有意简化了错误处理，显而易见的是，应该检查 <code>os.Open</code> 返回的错误值，然而，使用 <code>input.Scan</code> 读取文件过程中，不大可能出现错误，因此我们忽略了错误处理。我们会在跳过错误检查的地方做说明。5.4 节中深入介绍错误处理。</p>
<p>注意 <code>countLines</code> 函数在其声明前被调用。函数和包级别的变量（package-level entities）可以任意顺序声明，并不影响其被调用。（译注：最好还是遵循一定的规范）</p>
<p><code>map</code> 是一个由 <code>make</code> 函数创建的数据结构的引用。<code>map</code> 作为参数传递给某函数时，该函数接收这个引用的一份拷贝（copy，或译为副本），被调用函数对 <code>map</code> 底层数据结构的任何修改，调用者函数都可以通过持有的 <code>map</code> 引用看到。在我们的例子中，<code>countLines</code> 函数向 <code>counts</code> 插入的值，也会被 <code>main</code> 函数看到。（译注：类似于 C++ 里的引用传递，实际上指针是另一个指针了，但内部存的值指向同一块内存）</p>
<p><code>dup</code> 的前两个版本以&quot;流”模式读取输入，并根据需要拆分成多个行。理论上，这些程序可以处理任意数量的输入数据。还有另一个方法，就是一口气把全部输入数据读到内存中，一次分割为多行，然后处理它们。下面这个版本，<code>dup3</code>，就是这么操作的。这个例子引入了 <code>ReadFile</code> 函数（来自于<code>io/ioutil</code>包），其读取指定文件的全部内容，<code>strings.Split</code> 函数把字符串分割成子串的切片。（<code>Split</code> 的作用与前文提到的 <code>strings.Join</code> 相反。）</p>
<p><code>dup</code> 的前两个版本以&quot;流”模式读取输入，并根据需要拆分成多个行。理论上，这些程序可以处理任意数量的输入数据。还有另一个方法，就是一口气把全部输入数据读到内存中，一次分割为多行，然后处理它们。下面这个版本，<code>dup3</code>，就是这么操作的。这个例子引入了 <code>ReadFile</code> 函数（来自于<code>io/ioutil</code>包），其读取指定文件的全部内容，<code>strings.Split</code> 函数把字符串分割成子串的切片。（<code>Split</code> 的作用与前文提到的 <code>strings.Join</code> 相反。请注意如果在Windows下测试注意换行是否为\r\n，否则最后一行是否有空行将会影响结果。）</p>
<p>我们略微简化了 <code>dup3</code>。首先，由于 <code>ReadFile</code> 函数需要文件名作为参数，因此只读指定文件，不读标准输入。其次，由于行计数代码只在一处用到，故将其移回 <code>main</code> 函数。</p>
<p><u><i>gopl.io/ch1/dup3</i></u></p>
<pre><code class="language-go">package main
searchindex.js
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Object.assign(window.search, {"doc_urls":["index.html#go语言圣经中文版","preface-zh.html#译者序","preface.html#前言","preface.html#go语言起源","preface.html#go语言项目","preface.html#本书的组织","preface.html#更多的信息","preface.html#致谢","ch1/ch1.html#第1章-入门","ch1/ch1-01.html#11-hello-world","ch1/ch1-02.html#12-命令行参数","ch1/ch1-03.html#13-查找重复的行","ch1/ch1-04.html#14-gif动画","ch1/ch1-05.html#15-获取url","ch1/ch1-06.html#16-并发获取多个url","ch1/ch1-07.html#17-web服务","ch1/ch1-08.html#18-本章要点","ch2/ch2.html#第2章-程序结构","ch2/ch2-01.html#21-命名","ch2/ch2-02.html#22-声明","ch2/ch2-03.html#23-变量","ch2/ch2-03.html#231-简短变量声明","ch2/ch2-03.html#232-指针","ch2/ch2-03.html#233-new函数","ch2/ch2-03.html#234-变量的生命周期","ch2/ch2-04.html#24-赋值","ch2/ch2-04.html#241-元组赋值","ch2/ch2-04.html#242-可赋值性","ch2/ch2-05.html#25-类型","ch2/ch2-06.html#26-包和文件","ch2/ch2-06.html#261-导入包","ch2/ch2-06.html#262-包的初始化","ch2/ch2-07.html#27-作用域","ch3/ch3.html#第3章-基础数据类型","ch3/ch3-01.html#31-整型","ch3/ch3-02.html#32-浮点数","ch3/ch3-03.html#33-复数","ch3/ch3-04.html#34-布尔型","ch3/ch3-05.html#35-字符串","ch3/ch3-05.html#351-字符串面值","ch3/ch3-05.html#352-unicode","ch3/ch3-05.html#353-utf-8","ch3/ch3-05.html#354-字符串和byte切片","ch3/ch3-05.html#355-字符串和数字的转换","ch3/ch3-06.html#36-常量","ch3/ch3-06.html#361-iota-常量生成器","ch3/ch3-06.html#362-无类型常量","ch4/ch4.html#第4章-复合数据类型","ch4/ch4-01.html#41-数组","ch4/ch4-02.html#42-slice","ch4/ch4-02.html#421-append函数","ch4/ch4-02.html#422-slice内存技巧","ch4/ch4-03.html#43-map","ch4/ch4-04.html#44-结构体","ch4/ch4-04.html#441-结构体字面值","ch4/ch4-04.html#442-结构体比较","ch4/ch4-04.html#443-结构体嵌入和匿名成员","ch4/ch4-05.html#45-json","ch4/ch4-06.html#46-文本和html模板","ch5/ch5.html#第5章-函数","ch5/ch5-01.html#51-函数声明","ch5/ch5-02.html#52-递归","ch5/ch5-03.html#53-多返回值","ch5/ch5-04.html#54-错误","ch5/ch5-04.html#541-错误处理策略","ch5/ch5-04.html#542-文件结尾错误eof","ch5/ch5-05.html#55-函数值","ch5/ch5-06.html#56-匿名函数","ch5/ch5-06.html#561-警告捕获迭代变量","ch5/ch5-07.html#57-可变参数","ch5/ch5-08.html#58-deferred函数","ch5/ch5-09.html#59-panic异常","ch5/ch5-10.html#510-recover捕获异常","ch6/ch6.html#第6章-方法","ch6/ch6-01.html#61-方法声明","ch6/ch6-02.html#62-基于指针对象的方法","ch6/ch6-02.html#621-nil也是一个合法的接收器类型","ch6/ch6-03.html#63-通过嵌入结构体来扩展类型","ch6/ch6-04.html#64-方法值和方法表达式","ch6/ch6-05.html#65-示例-bit数组","ch6/ch6-06.html#66-封装","ch7/ch7.html#第7章-接口","ch7/ch7-01.html#71-接口约定","ch7/ch7-02.html#72-接口类型","ch7/ch7-03.html#73-实现接口的条件","ch7/ch7-04.html#74-flagvalue接口","ch7/ch7-05.html#75--接口值","ch7/ch7-05.html#751--警告一个包含nil指针的接口不是nil接口","ch7/ch7-06.html#76-sortinterface接口","ch7/ch7-07.html#77-httphandler接口","ch7/ch7-08.html#78-error接口","ch7/ch7-09.html#79-示例-表达式求值","ch7/ch7-10.html#710-类型断言","ch7/ch7-11.html#711-基于类型断言区别错误类型","ch7/ch7-12.html#712-通过类型断言询问行为","ch7/ch7-13.html#713-类型分支","ch7/ch7-14.html#714-示例-基于标记的xml解码","ch7/ch7-15.html#715-一些建议","ch8/ch8.html#第8章-goroutines和channels","ch8/ch8-01.html#81-goroutines","ch8/ch8-02.html#82-示例-并发的clock服务","ch8/ch8-03.html#83-示例-并发的echo服务","ch8/ch8-04.html#84-channels","ch8/ch8-04.html#841-不带缓存的channels","ch8/ch8-04.html#842-串联的channelspipeline","ch8/ch8-04.html#843-单方向的channel","ch8/ch8-04.html#844-带缓存的channels","ch8/ch8-05.html#85-并发的循环","ch8/ch8-06.html#86-示例-并发的web爬虫","ch8/ch8-07.html#87-基于select的多路复用","ch8/ch8-08.html#88-示例-并发的目录遍历","ch8/ch8-09.html#89-并发的退出","ch8/ch8-10.html#810-示例-聊天服务","ch9/ch9.html#第9章-基于共享变量的并发","ch9/ch9-01.html#91-竞争条件","ch9/ch9-02.html#92-syncmutex互斥锁","ch9/ch9-03.html#93-syncrwmutex读写锁","ch9/ch9-04.html#94-内存同步","ch9/ch9-05.html#95-synconce惰性初始化","ch9/ch9-06.html#96-竞争条件检测","ch9/ch9-07.html#97-示例-并发的非阻塞缓存","ch9/ch9-08.html#98-goroutines和线程","ch9/ch9-08.html#981-动态栈","ch9/ch9-08.html#982-goroutine调度","ch9/ch9-08.html#983-gomaxprocs","ch9/ch9-08.html#984-goroutine没有id号","ch10/ch10.html#第10章-包和工具","ch10/ch10-01.html#101-包简介","ch10/ch10-02.html#102-导入路径","ch10/ch10-03.html#103-包声明","ch10/ch10-04.html#104-导入声明","ch10/ch10-05.html#105-包的匿名导入","ch10/ch10-06.html#Line truncated
searchindex.json
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