//Bad case
{someData.map(item =>(
<div key={item.id}> hello! </div>
))}
//Good case
{React.Children.toArray(
someData.map(item =><div> hello! </div>)
)}
React.Children.toArrayを利用する場合、key属性は要らなくなります。
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【React】 僕だけ知らない Tip (React.Children.toArray)
Last updated at Posted at 2021-06-12
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