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Excel の AA 形式のカラム名と配列インデックスを相互変換する JavaScript

Excel では、列名が A・B・C・・・Y・Z・AA・AB・・・XFC・XFD 形式にで表示されます。
配列のインデックス(添字)と列名を相互変換する JavaScript ワンライナー。↓

// Excel Column to Index
const col2idx = c => c.split("").reduce((prev, c) => (prev * 26 + parseInt(c, 36) - 9), 0) - 1;

// Index to Excel Column
const idx2col = n => ((n > 25 ? idx2col(Math.floor(n / 26 - 1)) : "") + (n % 26 + 10).toString(36).toUpperCase());


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