g the selector name.</p></li>
</ul>


<h4>Expression usage</h4>

<p><strong>Note:</strong> This function is exposed to the Mockingbird environment with a
name that differs from that of its implementing method:</p>

<pre><code>^instancesRespondToSelector(NSString|availableStringEncodings)
</code></pre>

<p>The expression above evaluates to <code>@YES</code> because the <code>NSString</code> class responds
to the <code>availableStringEncodings</code> message.</p>
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