Using Iterators as children is unsupported and will likely yield unexpected results because enumerating a generator mutates it. You may convert it to an array with `Array.from()` or the `[...spread]` operator before rendering. You can also use an Iterabl~

はじめに

• ダミーデータを配列で作ってレンダリングしたかった
• エラーメッセージ全文は以下

Using Iterators as children is unsupported and will likely yield unexpected results because enumerating a generator mutates it. 
You may convert it to an array with `Array.from()` or the `[...spread]` operator before rendering. 
You can also use an Iterable that can iterate multiple times over the same items.

問題

• エラーで要素がレンダリングされない

解決

• ダミーデータ作成をArray(10).keys().map としてしまっていたところを、 [...Array(10).keys()].map にして解決

終わりに

• この辺調べてまとめたい