common in functional programming patterns.</p><pre><code data-lang="oak"><span class="oak-comment">// print 2n for every prime n in range [0, 10)</span>
<span class="oak-fnName">range</span><span class="oak-leftParen">(</span><span class="oak-numberLiteral">10</span><span class="oak-rightParen">) </span><span class="oak-pipeArrow">|> </span><span class="oak-fnName">filter</span><span class="oak-leftParen">(</span><span class="oak-identifier">prime?</span><span class="oak-rightParen">) </span><span class="oa