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<h1 class="title">if</h1>
<nav id="TOC"><ul></ul></nav><p><small>There is a new edition of the book and this is an old link.</small></p>
<blockquote>
<p>An <code>if</code> expression allows us to branch our code depending on conditions.</p>
</blockquote>
<pre class="rust rust-example-rendered">
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">number</span> <span class="op">=</span> <span class="number">3</span>;
<span class="kw">if</span> <span class="ident">number</span> <span class="op"><</span> <span class="number">5</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"condition was true"</span>);
} <span class="kw">else</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"condition was false"</span>);
}
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0A%20%20%20%20let%20number%20%3D%203%3B%0A%0A%20%20%20%20if%20number%20%3C%205%20%7B%0A%20%20%20%20%20%20%20%20println!(%22condition%20was%20true%22)%3B%0A%20%20%20%20%7D%20else%20%7B%0A%20%20%20%20%20%20%20%20println!(%22condition%20was%20false%22)%3B%0A%20%20%20%20%7D%0A%7D%0A">Run</a></pre>
<hr />
<p>Here are the relevant sections in the new and old books:</p>
<ul>
<li><strong><a href="second-edition/ch03-05-control-flow.html#if-expressions">In the second edition: Ch 3.05 — Control flow</a></strong></li>
<li><small><a href="first-edition/if.html">In the first edition: Ch 3.5 — if</a></small></li>
</ul>
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