een</a> string, using the provided <a href="join-to-string.html">f</a> function to transform each element to a string.</p><span class="kdoc-tag"><h4 class="">Return</h4><p class="paragraph">A <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html">String</a> containing the concatenated strings of the flow elements, separated by the <a href="join-to-string.html">between</a> string.</p><p class="paragraph">Example usage:</p><div class="sample-container"><pre><code class="block lang-ko