<p>안녕하세요 강사님 혹시 궁금한게 있는데 여기서&nbsp;</p>
<p>chatrooms.length &gt;0 &amp;&amp; 이걸 왜넣는지 궁금합니다.&nbsp;</p>
<p>빼고 넣어도 잘 렌더링되는데 넣어주는 이유가 있을까요?</p>
<div><span style="color: #dcdcaa;">renderChatRooms</span>&nbsp;=&nbsp;(<span style="color: #9cdcfe;">chatRooms</span>)&nbsp;<span style="color: #569cd6;">=&gt;</span></div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #9cdcfe;">chatRooms</span>.<span style="color: #9cdcfe;">length</span>&nbsp;&gt;&nbsp;<span style="color: #b5cea8;">0</span>&nbsp;&amp;&amp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #9cdcfe;">chatRooms</span>.<span style="color: #dcdcaa;">map</span>(<span style="color: #9cdcfe;">room</span>&nbsp;<span style="color: #569cd6;">=&gt;</span>&nbsp;(</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #808080;">&lt;</span><span style="color: #569cd6;">li</span></div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #9cdcfe;">key</span>=<span style="color: #569cd6;">{</span><span style="color: #9cdcfe;">room</span>.<span style="color: #9cdcfe;">id</span><span style="color: #569cd6;">}</span></div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #808080;">&gt;</span></div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;<span style="color: #569cd6;">{</span><span style="color: #9cdcfe;">room</span>.<span style="color: #9cdcfe;">name</span><span style="color: #569cd6;">}</span></div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #808080;">&lt;/</span><span style="color: #569cd6;">li</span><span style="color: #808080;">&gt;</span></div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;))</div>
<div></div>
<div></div>

<p>안녕하세요 빠스단님 !&nbsp;&nbsp;<br />채팅 방이 하나 이상일때는 저 부분이 렌더링 되어야하지만&nbsp;</p>
<p>하나가 안되면 저부분이 필요없잖아요 ~&nbsp;&nbsp;<br />그래서 저러한 로직을 이용해주면 됩니다 ~~ !&nbsp;</p>

인프런 커뮤니티 질문&답변

안녕하세요!