回答編集履歴
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修正
answer
CHANGED
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@@ -2,5 +2,5 @@
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2
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3
3
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```JavaScript
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4
4
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const array = ["a", "b", "c", "d", "e", "e", "b", "e", "c", "a", "d"];
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5
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-
console.log(array.join("").
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5
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+
console.log([...array.sort().join("").matchAll(/(.)\1+/g)].map(a => a[0]).sort((a, b) => b.length - a.length)[0][0]);
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6
6
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```
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