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<h1 class="title">Match</h1>
<p><small>There is a new edition of the book and this is an old link.</small></p>
<blockquote>
<p><code>match</code> allows us to compare a value against a series of patterns and then execute code based on which pattern matches.
Patterns can be made up of literal values, variable names, wildcards, and many other things.</p>
</blockquote>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">enum</span> <span class="ident">Coin</span> {
<span class="ident">Penny</span>,
<span class="ident">Nickel</span>,
<span class="ident">Dime</span>,
<span class="ident">Quarter</span>,
}
<span class="kw">fn</span> <span class="ident">value_in_cents</span>(<span class="ident">coin</span>: <span class="ident">Coin</span>) <span class="op">-></span> <span class="ident">u32</span> {
<span class="kw">match</span> <span class="ident">coin</span> {
<span class="ident">Coin</span>::<span class="ident">Penny</span> <span class="op">=></span> <span class="number">1</span>,
<span class="ident">Coin</span>::<span class="ident">Nickel</span> <span class="op">=></span> <span class="number">5</span>,
<span class="ident">Coin</span>::<span class="ident">Dime</span> <span class="op">=></span> <span class="number">10</span>,
<span class="ident">Coin</span>::<span class="ident">Quarter</span> <span class="op">=></span> <span class="number">25</span>,
}
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Aenum%20Coin%20%7B%0A%20%20%20%20Penny%2C%0A%20%20%20%20Nickel%2C%0A%20%20%20%20Dime%2C%0A%20%20%20%20Quarter%2C%0A%7D%0A%0Afn%20value_in_cents(coin%3A%20Coin)%20-%3E%20u32%20%7B%0A%20%20%20%20match%20coin%20%7B%0A%20%20%20%20%20%20%20%20Coin%3A%3APenny%20%3D%3E%201%2C%0A%20%20%20%20%20%20%20%20Coin%3A%3ANickel%20%3D%3E%205%2C%0A%20%20%20%20%20%20%20%20Coin%3A%3ADime%20%3D%3E%2010%2C%0A%20%20%20%20%20%20%20%20Coin%3A%3AQuarter%20%3D%3E%2025%2C%0A%20%20%20%20%7D%0A%7D%0A%7D">Run</a></pre></div>
<hr />
<p>Here are the relevant sections in the new and old books:</p>
<ul>
<li><strong><a href="ch06-02-match.html">in the current edition: Ch 6.02 — The <code>match</code> Control Flow Operator</a></strong></li>
<li><a href="ch18-00-patterns.html">in the current edition: Ch 18.00 — Patterns</a></li>
<li><small><a href="https://doc.rust-lang.org/1.30.0/book/first-edition/match.html">In the first edition: Ch 3.14 — Match</a></small></li>
</ul>
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