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map メソッドのユニークなキーがないと出るエラー

Posted at

コンソール上で以下のエラー

index.js:1 Warning: Each child in a list should have a unique "key" prop.

これは map メソッドで作られる要素に
ユニークなキーがないとでるエラー

しかし

 [...Array(12).keys()].map(i =>
              <ItemWrapper >
                <Skeleton  key={i} variant="rect" width={450} height={180} />
              </ItemWrapper>                
            )

ついてますが。は?
ってなった


どうやら

 [...Array(12).keys()].map(i =>
              <ItemWrapper key={i} >
                <Skeleton variant="rect" width={450} height={180} />
              </ItemWrapper>                
            )

一番外側の要素がユニークである必要があるそう

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