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correct the duplicated code

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2014-06-09 15:55:49 +08:00
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chapter2/06_Functions.html
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<div class="book" data-level="2.6" data-basepath=".." data-revision="1402300340983">
<div class="book" data-level="2.6" data-basepath=".." data-revision="1402300498179">
<div class="book-header">
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<div class="page-inner">
<section class="normal" id="section-gitbook_79">
<section class="normal" id="section-gitbook_137">
<h1 id="-functions-">函数（Functions）</h1>
<p>本页包含内容：</p>
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<pre><code> join(string: &quot;hello&quot;, toString: &quot;world&quot;, withJoiner: &quot;-&quot;)
// returns &quot;hello-world
</code></pre><p>当这个函数被调用时，如果<code>joiner</code>的值没有被指定，函数会使用默认值（&quot; &quot;）：</p>
<pre><code> join(string: &quot;hello&quot;, toString: &quot;world&quot;, withJoiner: &quot;-&quot;)
// returns &quot;hello-world
<pre><code> join(string: &quot;hello&quot;, toString:&quot;world&quot;)
// returns &quot;hello world&quot;
</code></pre><h3 id="-external-names-for-parameters-with-default-values-">默认值参数的外部参数名（External Names for Parameters with Default Values）</h3>
<p>在大多数情况下，给带默认值的参数起一个外部参数名是很有用的。这样可以保证当函数被调用且带默认值的参数被提供值时，实参的意图是明显的。</p>
<p>为了使定义外部参数名更加简单，当你未给带默认值的参数提供外部参数名时，Swift会自动提供外部名字。此时外部参数名与局部名字是一样的，就像你已经在局部参数名前写了<code>井号（#）</code>一样。</p>