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chapter3/07_Patterns.html
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<div class="book" data-level="3.8" data-basepath=".." data-revision="1402390224923">
<div class="book" data-level="3.8" data-basepath=".." data-revision="1402397411238">
<div class="book-header">
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<a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
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<div class="page-inner">
<section class="normal" id="section-gitbook_136">
<section class="normal" id="section-gitbook_59">
<h1 id="-patterns-">模式（Patterns）</h1>
<p>模式（pattern）代表了单个值或者复合值的结构。例如，元组<code>(1, 2)</code>的结构是逗号分隔的，包含两个元素的列表。因为模式代表一种值的结构，而不是特定的某个值，你可以把模式和各种同类型的值匹配起来。比如，<code>(x, y)</code>可以匹配元组<code>(1, 2)</code>，以及任何含两个元素的元组。除了将模式与一个值匹配外，你可以从合成值中提取出部分或全部，然后分别把各个部分和一个常量或变量绑定起来。</p>