</code></td></tr><tr><th id="associatedtypes">Associated Types</th><td><span id="aliasesmark"></span><div class="declaration"><code class="language-swift">associatedtype Element</code><div class="comment"></div></div></td></tr></table><div class="discussion comment"><p>You use types that conform to the <code>SetAlgebra</code> protocol when you need
efficient membership tests or mathematical set operations such as
intersection, union, and subtraction. In the standard library, you can
use the <code>Set</code>