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<pre class="pygments highlight"><code data-lang="ruby"><span></span><span class="tok-k">class</span><span class="tok-w"> </span><span class="tok-nc">NilClass</span>
<span class="tok-w"> </span><span class="tok-k">alias</span><span class="tok-w"> </span><span class="tok-ss">:nil_or_empty?</span><span class="tok-w"> </span><span class="tok-ss">:nil?</span>
<span class="tok-k">end</span>
<span class="tok-k">class</span><span class="tok-w"> </span><span class="tok-nc">String</span>
<span class="tok-w"> </span><span class="tok-k">def</span><span class="tok-w"> </span><span class="tok-nf">nil_or_empty?</span>
<span class="tok-w"> </span><span class="tok-k">alias</span><span class="tok-w"> </span><span class="tok-ss">:nil_or_empty?</span><span class="tok-w"> </span><span class="tok-ss">:empty?</span>
<span class="tok-w"> </span><span class="tok-k">end</span>
<span class="tok-k">end</span>
<span class="tok-n">v</span><span class="tok-w"> </span><span class="tok-o">=</span><span class="tok-w"> </span><span class="tok-kp">nil</span>
<span class="tok-nb">puts</span><span class="tok-w"> </span><span class="tok-n">v</span><span class="tok-o">.</span><span class="tok-n">nil_or_empty?</span></code></pre>
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