code></pre><p>The <strong>push operator</strong> <code>&lt;&lt;</code> pushes values onto the end of an iterable value (a string or a list), and returns the changed string or list. This was possible in Ink, but had a much clunkier notation:</p><pre><code data-lang="oak"><span class="oak-comment">// Ink</span>
<span class="oak-identifier">list</span><span class="oak-dot">.</span><span class="oak-leftParen">(</span><span class="oak-fnName">len</span><span class="oak-leftParen">(</span><span class="oak-identif