質問編集履歴
1
内容修正
test
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File without changes
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test
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@@ -22,29 +22,23 @@
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return(
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<
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<button
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{
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onClick={() => {
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setItems(items.concat({id: 1, value: "hoge"})) // (1)
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on
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/* setItems(items?.concat({id: 1, value: "hoge"})) (2)*/
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console.log(items)
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}
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}>
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Add
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}>
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Add
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</button>
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</>
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)
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