 equivalent to <code>(<span class="fu">cons</span> a (<span class="kw">delay</span> b))</code>.</li>
</ul>
<h3 id="3.5.1.1" class="anchor">
<a class="anchor__link link" href="#3.5.1.1" aria-hidden="true">#</a> The stream implementation in action
</h3>
<blockquote>
<p>In general, we can think of delayed evaluation as “demand-driven” programming, we herby each stage in the stream process is activated only enough to satisfy the next stage. <a class="citation" href="https://mitp-content-server.mit.edu/books