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<h1 class="title">Method Syntax</h1>
<p><small>There is a new edition of the book and this is an old link.</small></p>
<blockquote>
<p>Methods are different from functions in that they’re defined within the context of a struct, and their first parameter is always <code>self</code>, which represents the instance of the struct the method is being called on.</p>
</blockquote>
<pre class="rust rust-example-rendered">
<span class="kw">impl</span> <span class="ident">Rectangle</span> {
<span class="kw">fn</span> <span class="ident">area</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u32</span> {
<span class="self">self</span>.<span class="ident">width</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">height</span>
}
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Astruct%20Rectangle%20%7B%0A%20%20%20%20width%3A%20u32%2C%0A%20%20%20%20height%3A%20u32%2C%0A%7D%0A%0Aimpl%20Rectangle%20%7B%0A%20%20%20%20fn%20area(%26self)%20-%3E%20u32%20%7B%0A%20%20%20%20%20%20%20%20self.width%20*%20self.height%0A%20%20%20%20%7D%0A%7D%0A%7D">Run</a></pre>
<hr />
<p>Here are the relevant sections in the new and old books:</p>
<ul>
<li><strong><a href="second-edition/ch05-03-method-syntax.html">In the second edition: Ch 5.03 — Method Syntax</a></strong></li>
<li><small><a href="first-edition/method-syntax.html">In the first edition: Ch 3.16 — Method Syntax</a></small></li>
</ul>
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