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<h1 class="title">Iterators</h1>
<p><small>There is a new edition of the book and this is an old link.</small></p>
<blockquote>
<p>The iterator pattern allows you to perform some task on a sequence of items in turn.
An iterator is responsible for the logic of iterating over each item and determining when the sequence has finished.</p>
</blockquote>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">v1</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let</span> <span class="ident">v1_iter</span> <span class="op">=</span> <span class="ident">v1</span>.<span class="ident">iter</span>();
<span class="kw">for</span> <span class="ident">val</span> <span class="kw">in</span> <span class="ident">v1_iter</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Got: {}"</span>, <span class="ident">val</span>);
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20v1%20%3D%20vec!%5B1%2C%202%2C%203%5D%3B%0A%0Alet%20v1_iter%20%3D%20v1.iter()%3B%0A%0Afor%20val%20in%20v1_iter%20%7B%0A%20%20%20%20println!(%22Got%3A%20%7B%7D%22%2C%20val)%3B%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/ch13-02-iterators.html">In the second edition: Ch 13.02 — Iterators</a></strong></li>
<li><small><a href="first-edition/iterators.html">In the first edition: Ch 4.5 — Iterators</a></small></li>
</ul>
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