l"><span class="token function">plus</span></a><span class="token punctuation">(</span><span class="parameters "><span class="parameter ">other<span class="token operator">: </span><a href="index.html">NotBlankString</a></span></span><span class="token punctuation">)</span><span class="token operator">: </span><a href="index.html">NotBlankString</a></div><div class="brief "><p class="paragraph">Concatenates this string with the <a href="../../kotools.types.experimental/plus.html">other</a> one.</p></div><di