<div style="color: #abb2bf; background-color: #23272e; font-family: 'Fira Code', Menlo, Monaco, 'Courier New', monospace; font-size: 18px; line-height: 27px; white-space: pre;">
<div><span style="color: #61afef;">log</span>(</div>
<div>[[<span style="color: #d19a66;">1</span>, <span style="color: #d19a66;">2</span>], [<span style="color: #d19a66;">3</span>, <span style="color: #d19a66;">4</span>], [<span style="color: #d19a66;">5</span>, <span style="color: #d19a66;">6</span>, <span style="color: #d19a66;">7</span>], <span style="color: #d19a66;">8</span>, <span style="color: #d19a66;">9</span>].<span style="color: #61afef;">flatMap</span>((<span style="color: #e06c75;">a</span>) <span style="color: #c678dd;">=&gt;</span> <span style="color: #e06c75;">a</span>.<span style="color: #61afef;">map</span>((<span style="color: #e06c75;">a</span>) <span style="color: #c678dd;">=&gt;</span> <span style="color: #e06c75;">a</span> <span style="color: #56b6c2;">*</span> <span style="color: #e06c75;">a</span>))</div>
<div>)</div>
<div>map이 함수가 아니라고 나오는데 왜 그런지 궁금합니다.</div>
</div>

<p>a가 무엇인지 확인해보세요 :)&nbsp;</p>

<p>TypeError : a.map is not a function 라고 나오는데 왜 그런지 궁금합니다 ^^</p>

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질문)있습니다^^