en keyword">fun </span><a href="plus.html"><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="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html">Any</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 wit