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doc: update rust.md (#178)

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* doc: match let

* update 9751df06b9
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jaywcjlove
2022-11-26 17:53:56 +00:00
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@ -904,10 +904,20 @@
<pre class="language-rust"><code class="language-rust code-highlight"><span class="code-line"><span class="token keyword">let</span> <span class="token punctuation">(</span>x<span class="token punctuation">,</span> _<span class="token punctuation">,</span> y<span class="token punctuation">)</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"><span class="token macro property">println!</span><span class="token punctuation">(</span><span class="token string">"{x},{y}"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span></code></pre>
<hr>
<pre class="language-rust"><code class="language-rust code-highlight"><span class="code-line"><span class="token keyword">fn</span> <span class="token function-definition function">get_count_item</span><span class="token punctuation">(</span>s<span class="token punctuation">:</span> <span class="token operator">&#x26;</span><span class="token keyword">str</span><span class="token punctuation">)</span> <span class="token punctuation">-></span> <span class="token punctuation">(</span><span class="token operator">&#x26;</span><span class="token keyword">str</span><span class="token punctuation">,</span> <span class="token operator">&#x26;</span><span class="token keyword">str</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
</span><span class="code-line"> <span class="token keyword">let</span> <span class="token keyword">mut</span> it <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token char">' '</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"> <span class="token keyword">let</span> <span class="token punctuation">(</span><span class="token class-name">Some</span><span class="token punctuation">(</span>str1<span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token class-name">Some</span><span class="token punctuation">(</span>str2<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">=</span> <span class="token punctuation">(</span>it<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>it<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
</span><span class="code-line"> <span class="token macro property">panic!</span><span class="token punctuation">(</span><span class="token string">"Can't segment count item pair"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"> <span class="token punctuation">}</span><span class="token punctuation">;</span>
</span><span class="code-line"> <span class="token punctuation">(</span>str1<span class="token punctuation">,</span> str2<span class="token punctuation">)</span>
</span><span class="code-line"><span class="token punctuation">}</span>
</span></code></pre>
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="函数中的模式匹配"><a aria-hidden="true" tabindex="-1" href="#函数中的模式匹配"><span class="icon icon-link"></span></a>函数中的模式匹配</h3><div class="wrap-body">
<pre class="language-rust"><code class="language-rust code-highlight"><span class="code-line"><span class="token keyword">fn</span> <span class="token function-definition function">add</span><span class="token punctuation">(</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token keyword">i32</span><span class="token punctuation">,</span> <span class="token keyword">i32</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">-></span> <span class="token keyword">i32</span> <span class="token punctuation">{</span>
</span><span class="code-line"> x <span class="token operator">+</span> y
</span><span class="code-line"><span class="token punctuation">}</span>
</span><span class="code-line">
</span><span class="code-line"><span class="token keyword">fn</span> <span class="token function-definition function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
</span><span class="code-line"> <span class="token keyword">let</span> sum <span class="token operator">=</span> <span class="token function">add</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"> <span class="token macro property">println!</span><span class="token punctuation">(</span><span class="token string">"{sum}"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>