ate_with-33e0c77147f944b0fee4b5d061901528">func update(with newMember: Self.Element) -> Self.Element?</a> <span class="required">Required</span><div class="comment collapse in" id="comment-update_with-33e0c77147f944b0fee4b5d061901528"><p>Inserts the given element into the set unconditionally.</p>
<p>If an element equal to <code>newMember</code> is already contained in the set,
<code>newMember</code> replaces the existing element. In this example, an existing
element is inserted into <code>classDays</code>, 