【JavaScript】AtCoder に登録したら次にやること ～これだけ解けば十分闘える！過去問精選 10 問～を解いた感想 - Qiita

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[shunkeen]

３問目の大喜利会場？　Math.min(...numbers.map(x => x.toString(2).replace(/(.*1)/, '').length));

[aya_momo]

3問目の解法はムダが多いね。

[hase0510]

「foreachではダメなのか」は numbers.forEach((num, i) => { numbers[i] = num / 2; }) としたらいいんじゃないですかね