on"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">prefix</span></span> ])
            <span class="returntype parameter">&#8594; <a href="dart-async/Future-class.html">Future</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-io/Directory-class.html">Directory</a></span>&gt;</span></span>
          </span>
                  </dt>
        <dd>
          Creates a temporary directory in this directory. Additional random
characters are appended