wip: section 1 is over!

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<ul class="chapter"><li><a href="ch01-00-introduction.html" class="active"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 &amp; 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li></ul> <ul class="chapter"><li><a href="ch01-00-introduction.html" class="active"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 &amp; 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li><li><a href="ch07-00-modules.html"><strong>7.</strong> 模块</a></li><li><ul class="section"><li><a href="ch07-01-mod-and-the-filesystem.html"><strong>7.1.</strong> <code>mod</code>和文件系统</a></li><li><a href="ch07-02-controlling-visibility-with-pub.html"><strong>7.2.</strong> 使用<code>pub</code>空值可见性</a></li><li><a href="ch07-03-importing-names-with-use.html"><strong>7.3.</strong> 使用<code>use</code>导入命名空间</a></li></ul></li></ul>
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@ -113,20 +113,6 @@ registry site<a href="https://crates.io/">crates.io</a>!我们期待看
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@ -148,20 +148,6 @@ commit f828919e62aa542aaaae03c1fb565da42374213e</p>
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<ul class="chapter"><li><a href="ch01-00-introduction.html"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html" class="active"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 &amp; 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li></ul> <ul class="chapter"><li><a href="ch01-00-introduction.html"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html" class="active"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 &amp; 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li><li><a href="ch07-00-modules.html"><strong>7.</strong> 模块</a></li><li><ul class="section"><li><a href="ch07-01-mod-and-the-filesystem.html"><strong>7.1.</strong> <code>mod</code>和文件系统</a></li><li><a href="ch07-02-controlling-visibility-with-pub.html"><strong>7.2.</strong> 使用<code>pub</code>空值可见性</a></li><li><a href="ch07-03-importing-names-with-use.html"><strong>7.3.</strong> 使用<code>use</code>导入命名空间</a></li></ul></li></ul>
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@ -272,20 +272,6 @@ $ carg
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@ -663,20 +663,6 @@ fn main() {
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<ul class="chapter"><li><a href="ch01-00-introduction.html"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html" class="active"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 &amp; 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li></ul> <ul class="chapter"><li><a href="ch01-00-introduction.html"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html" class="active"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 &amp; 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li><li><a href="ch07-00-modules.html"><strong>7.</strong> 模块</a></li><li><ul class="section"><li><a href="ch07-01-mod-and-the-filesystem.html"><strong>7.1.</strong> <code>mod</code>和文件系统</a></li><li><a href="ch07-02-controlling-visibility-with-pub.html"><strong>7.2.</strong> 使用<code>pub</code>空值可见性</a></li><li><a href="ch07-03-importing-names-with-use.html"><strong>7.3.</strong> 使用<code>use</code>导入命名空间</a></li></ul></li></ul>
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@ -122,20 +122,6 @@ commit 2067b6e2bff990bceb39ae8f35780bd3bed08644</p>
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@ -47,7 +47,7 @@
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@ -206,20 +206,6 @@ spaces = spaces.len();
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@ -294,20 +294,6 @@ error: Process didn't exit successfully: `target/debug/arrays` (exit code: 101)
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@ -381,20 +381,6 @@ fn calculate_length(s: String) -&gt; (String, usize) {
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@ -314,20 +314,6 @@ for it to be borrowed from.
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@ -47,7 +47,7 @@
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@ -321,20 +321,6 @@ let slice = &amp;a[1..3];
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@ -47,7 +47,7 @@
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<ul class="chapter"><li><a href="ch01-00-introduction.html"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 &amp; 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html" class="active"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li></ul> <ul class="chapter"><li><a href="ch01-00-introduction.html"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 &amp; 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html" class="active"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li><li><a href="ch07-00-modules.html"><strong>7.</strong> 模块</a></li><li><ul class="section"><li><a href="ch07-01-mod-and-the-filesystem.html"><strong>7.1.</strong> <code>mod</code>和文件系统</a></li><li><a href="ch07-02-controlling-visibility-with-pub.html"><strong>7.2.</strong> 使用<code>pub</code>空值可见性</a></li><li><a href="ch07-03-importing-names-with-use.html"><strong>7.3.</strong> 使用<code>use</code>导入命名空间</a></li></ul></li></ul>
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@ -335,20 +335,6 @@ fn main() {
<!-- Livereload script (if served using the cli tool) --> <!-- Livereload script (if served using the cli tool) -->
<script type="text/javascript">
var socket = new WebSocket("ws://localhost:3001");
socket.onmessage = function (event) {
if (event.data === "reload") {
socket.close();
location.reload(true); // force reload from server (not from cache)
}
};
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socket.close();
}
</script>
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@ -47,7 +47,7 @@
</script> </script>
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</div> </div>
<div id="page-wrapper" class="page-wrapper"> <div id="page-wrapper" class="page-wrapper">
@ -239,20 +239,6 @@ impl Rectangle {
<!-- Livereload script (if served using the cli tool) --> <!-- Livereload script (if served using the cli tool) -->
<script type="text/javascript">
var socket = new WebSocket("ws://localhost:3001");
socket.onmessage = function (event) {
if (event.data === "reload") {
socket.close();
location.reload(true); // force reload from server (not from cache)
}
};
window.onbeforeunload = function() {
socket.close();
}
</script>
<script src="highlight.js"></script> <script src="highlight.js"></script>
<script src="book.js"></script> <script src="book.js"></script>

@ -47,7 +47,7 @@
</script> </script>
<div id="sidebar" class="sidebar"> <div id="sidebar" class="sidebar">
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<div id="page-wrapper" class="page-wrapper"> <div id="page-wrapper" class="page-wrapper">
@ -117,20 +117,6 @@ commit 396e2db4f7de2e5e7869b1f8bc905c45c631ad7d</p>
<!-- Livereload script (if served using the cli tool) --> <!-- Livereload script (if served using the cli tool) -->
<script type="text/javascript">
var socket = new WebSocket("ws://localhost:3001");
socket.onmessage = function (event) {
if (event.data === "reload") {
socket.close();
location.reload(true); // force reload from server (not from cache)
}
};
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socket.close();
}
</script>
<script src="highlight.js"></script> <script src="highlight.js"></script>
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@ -47,7 +47,7 @@
</script> </script>
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@ -312,20 +312,6 @@ not satisfied
<!-- Livereload script (if served using the cli tool) --> <!-- Livereload script (if served using the cli tool) -->
<script type="text/javascript">
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@ -86,6 +86,62 @@ match some_u8_value {
<code>Some(3)</code></p> <code>Some(3)</code></p>
</figcaption> </figcaption>
</figure> </figure>
<p>我们想要对<code>Some(3)</code>匹配进行操作不过不想处理任何其他<code>Some&lt;u8&gt;</code>值或<code>None</code>值。为了满足<code>match</code>表达式(穷尽性)的要求,必须在处理完这唯一的成员后加上<code>_ =&gt; ()</code>,这样也要增加很多样板代码。</p>
<p>不过我们可以使用<code>if let</code>这种更短的方式编写。如下代码与列表 6-6 中的<code>match</code>行为一致:</p>
<pre><code class="language-rust"># let some_u8_value = Some(0u8);
if let Some(3) = some_u8_value {
println!(&quot;three&quot;);
}
</code></pre>
<p><code>if let</code>获取通过<code>=</code>分隔的一个模式和一个表达式。它的工作方式与<code>match</code>相同,这里的表达式对应<code>match</code>而模式则对应第一个分支。</p>
<p>使用<code>if let</code>意味着编写更少代码,更少的缩进和更少的样板代码。然而,这样会失去<code>match</code>强制要求的穷进行检查。<code>match</code><code>if let</code>之间的选择依赖特定的环境以及增加简洁度和失去穷尽性检查的权衡取舍。</p>
<p>换句话说,可以认为<code>if let</code><code>match</code>的一个语法糖,它当值匹配某一模式时执行代码而忽略所有其他值。</p>
<p>可以在<code>if let</code>中包含一个<code>else</code><code>else</code>块中的代码与<code>match</code>表达式中的<code>_</code>分支块中的代码相同,这样的<code>match</code>表达式就等同于<code>if let</code><code>else</code>。回忆一下列表 6-4 中<code>Coin</code>枚举的定义,它的<code>Quarter</code>成员包含一个<code>UsState</code>值。如果想要计数所有不是 25 美分的硬币的同时也报告 25 美分硬币所属的州,可以使用这样一个<code>match</code>表达式:</p>
<pre><code class="language-rust"># #[derive(Debug)]
# enum UsState {
# Alabama,
# Alaska,
# }
#
# enum Coin {
# Penny,
# Nickel,
# Dime,
# Quarter(UsState),
# }
# let coin = Coin::Penny;
let mut count = 0;
match coin {
Coin::Quarter(state) =&gt; println!(&quot;State quarter from {:?}!&quot;, state),
_ =&gt; count += 1,
}
</code></pre>
<p>或者可以使用这样的<code>if let</code><code>else</code>表达式:</p>
<pre><code class="language-rust"># #[derive(Debug)]
# enum UsState {
# Alabama,
# Alaska,
# }
#
# enum Coin {
# Penny,
# Nickel,
# Dime,
# Quarter(UsState),
# }
# let coin = Coin::Penny;
let mut count = 0;
if let Coin::Quarter(state) = coin {
println!(&quot;State quarter from {:?}!&quot;, state);
} else {
count += 1;
}
</code></pre>
<p>如果你的程序遇到一个使用<code>match</code>表达起来过于啰嗦的逻辑,记住<code>if let</code>也在你的 Rust 工具箱中。</p>
<h2>总结</h2>
<p>现在我们涉及到了如何使用枚举来创建有一系列可列举值的自定义类型。我们也展示了标准库的<code>Option&lt;T&gt;</code>类型是如何帮助你利用类型系统来避免出错。当枚举值包含数据时,你可以根据需要处理多少情况来选择使用<code>match</code><code>if let</code>来获取并使用这些值。</p>
<p>你的 Rust 程序现在能够使用结构体和枚举在自己的作用域内表现其内容了。在你的 API 中使用自定义类型保证了类型安全:编译器会确保你的函数只会得到它期望的类型的值。</p>
<p>为了向你的用户提供一个组织良好的 API它使用直观且只向用户暴露他们确实需要的部分那么让我们转向 Rust 的模块系统吧。</p>
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@ -112,20 +112,6 @@ registry site<a href="https://crates.io/">crates.io</a>!我们期待看
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@ -3048,6 +3048,62 @@ match some_u8_value {
<code>Some(3)</code></p> <code>Some(3)</code></p>
</figcaption> </figcaption>
</figure> </figure>
<p>我们想要对<code>Some(3)</code>匹配进行操作不过不想处理任何其他<code>Some&lt;u8&gt;</code>值或<code>None</code>值。为了满足<code>match</code>表达式(穷尽性)的要求,必须在处理完这唯一的成员后加上<code>_ =&gt; ()</code>,这样也要增加很多样板代码。</p>
<p>不过我们可以使用<code>if let</code>这种更短的方式编写。如下代码与列表 6-6 中的<code>match</code>行为一致:</p>
<pre><code class="language-rust"># let some_u8_value = Some(0u8);
if let Some(3) = some_u8_value {
println!(&quot;three&quot;);
}
</code></pre>
<p><code>if let</code>获取通过<code>=</code>分隔的一个模式和一个表达式。它的工作方式与<code>match</code>相同,这里的表达式对应<code>match</code>而模式则对应第一个分支。</p>
<p>使用<code>if let</code>意味着编写更少代码,更少的缩进和更少的样板代码。然而,这样会失去<code>match</code>强制要求的穷进行检查。<code>match</code><code>if let</code>之间的选择依赖特定的环境以及增加简洁度和失去穷尽性检查的权衡取舍。</p>
<p>换句话说,可以认为<code>if let</code><code>match</code>的一个语法糖,它当值匹配某一模式时执行代码而忽略所有其他值。</p>
<p>可以在<code>if let</code>中包含一个<code>else</code><code>else</code>块中的代码与<code>match</code>表达式中的<code>_</code>分支块中的代码相同,这样的<code>match</code>表达式就等同于<code>if let</code><code>else</code>。回忆一下列表 6-4 中<code>Coin</code>枚举的定义,它的<code>Quarter</code>成员包含一个<code>UsState</code>值。如果想要计数所有不是 25 美分的硬币的同时也报告 25 美分硬币所属的州,可以使用这样一个<code>match</code>表达式:</p>
<pre><code class="language-rust"># #[derive(Debug)]
# enum UsState {
# Alabama,
# Alaska,
# }
#
# enum Coin {
# Penny,
# Nickel,
# Dime,
# Quarter(UsState),
# }
# let coin = Coin::Penny;
let mut count = 0;
match coin {
Coin::Quarter(state) =&gt; println!(&quot;State quarter from {:?}!&quot;, state),
_ =&gt; count += 1,
}
</code></pre>
<p>或者可以使用这样的<code>if let</code><code>else</code>表达式:</p>
<pre><code class="language-rust"># #[derive(Debug)]
# enum UsState {
# Alabama,
# Alaska,
# }
#
# enum Coin {
# Penny,
# Nickel,
# Dime,
# Quarter(UsState),
# }
# let coin = Coin::Penny;
let mut count = 0;
if let Coin::Quarter(state) = coin {
println!(&quot;State quarter from {:?}!&quot;, state);
} else {
count += 1;
}
</code></pre>
<p>如果你的程序遇到一个使用<code>match</code>表达起来过于啰嗦的逻辑,记住<code>if let</code>也在你的 Rust 工具箱中。</p>
<h2>总结</h2>
<p>现在我们涉及到了如何使用枚举来创建有一系列可列举值的自定义类型。我们也展示了标准库的<code>Option&lt;T&gt;</code>类型是如何帮助你利用类型系统来避免出错。当枚举值包含数据时,你可以根据需要处理多少情况来选择使用<code>match</code><code>if let</code>来获取并使用这些值。</p>
<p>你的 Rust 程序现在能够使用结构体和枚举在自己的作用域内表现其内容了。在你的 API 中使用自定义类型保证了类型安全:编译器会确保你的函数只会得到它期望的类型的值。</p>
<p>为了向你的用户提供一个组织良好的 API它使用直观且只向用户暴露他们确实需要的部分那么让我们转向 Rust 的模块系统吧。</p>
</div> </div>
@ -3074,20 +3130,6 @@ match some_u8_value {
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@ -27,3 +27,10 @@
- [定义枚举](ch06-01-defining-an-enum.md) - [定义枚举](ch06-01-defining-an-enum.md)
- [`match`控制流运算符](ch06-02-match.md) - [`match`控制流运算符](ch06-02-match.md)
- [`if let`简单控制流](ch06-03-if-let.md) - [`if let`简单控制流](ch06-03-if-let.md)
## 基本 Rust 技能
- [模块](ch07-00-modules.md)
- [`mod`和文件系统](ch07-01-mod-and-the-filesystem.md)
- [使用`pub`空值可见性](ch07-02-controlling-visibility-with-pub.md)
- [使用`use`导入命名空间](ch07-03-importing-names-with-use.md)

@ -24,3 +24,76 @@ Listing 6-6: A `match` that only cares about executing code when the value is
</figcaption> </figcaption>
</figure> </figure>
我们想要对`Some(3)`匹配进行操作不过不想处理任何其他`Some<u8>`值或`None`值。为了满足`match`表达式(穷尽性)的要求,必须在处理完这唯一的成员后加上`_ => ()`,这样也要增加很多样板代码。
不过我们可以使用`if let`这种更短的方式编写。如下代码与列表 6-6 中的`match`行为一致:
```rust
# let some_u8_value = Some(0u8);
if let Some(3) = some_u8_value {
println!("three");
}
```
`if let`获取通过`=`分隔的一个模式和一个表达式。它的工作方式与`match`相同,这里的表达式对应`match`而模式则对应第一个分支。
使用`if let`意味着编写更少代码,更少的缩进和更少的样板代码。然而,这样会失去`match`强制要求的穷进行检查。`match`和`if let`之间的选择依赖特定的环境以及增加简洁度和失去穷尽性检查的权衡取舍。
换句话说,可以认为`if let`是`match`的一个语法糖,它当值匹配某一模式时执行代码而忽略所有其他值。
可以在`if let`中包含一个`else`。`else`块中的代码与`match`表达式中的`_`分支块中的代码相同,这样的`match`表达式就等同于`if let`和`else`。回忆一下列表 6-4 中`Coin`枚举的定义,它的`Quarter`成员包含一个`UsState`值。如果想要计数所有不是 25 美分的硬币的同时也报告 25 美分硬币所属的州,可以使用这样一个`match`表达式:
```rust
# #[derive(Debug)]
# enum UsState {
# Alabama,
# Alaska,
# }
#
# enum Coin {
# Penny,
# Nickel,
# Dime,
# Quarter(UsState),
# }
# let coin = Coin::Penny;
let mut count = 0;
match coin {
Coin::Quarter(state) => println!("State quarter from {:?}!", state),
_ => count += 1,
}
```
或者可以使用这样的`if let`和`else`表达式:
```rust
# #[derive(Debug)]
# enum UsState {
# Alabama,
# Alaska,
# }
#
# enum Coin {
# Penny,
# Nickel,
# Dime,
# Quarter(UsState),
# }
# let coin = Coin::Penny;
let mut count = 0;
if let Coin::Quarter(state) = coin {
println!("State quarter from {:?}!", state);
} else {
count += 1;
}
```
如果你的程序遇到一个使用`match`表达起来过于啰嗦的逻辑,记住`if let`也在你的 Rust 工具箱中。
## 总结
现在我们涉及到了如何使用枚举来创建有一系列可列举值的自定义类型。我们也展示了标准库的`Option<T>`类型是如何帮助你利用类型系统来避免出错。当枚举值包含数据时,你可以根据需要处理多少情况来选择使用`match`或`if let`来获取并使用这些值。
你的 Rust 程序现在能够使用结构体和枚举在自己的作用域内表现其内容了。在你的 API 中使用自定义类型保证了类型安全:编译器会确保你的函数只会得到它期望的类型的值。
为了向你的用户提供一个组织良好的 API它使用直观且只向用户暴露他们确实需要的部分那么让我们转向 Rust 的模块系统吧。
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