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連想配列を指定した順番に並び替える

Last updated at Posted at 2020-06-29

名前順でも日付順でもなくてこの順番でソートしたい!
って時やりかたわかんなくてちょっと困っちゃったので忘備録。

例えば、干支。

const HogeItem = [
  { eto: '', ...hogehoge },
  { eto: '', ...hogehoge },
  { eto: '', ...hogehoge },
  { eto: '', ...hogehoge },
  { eto: '', ...hogehoge },
];

のような連想配列があって、これを干支順に並び替えたいと。
以下のコードで解決です。

const etoIndex = ['', '', '', '', ''];
HogeItem.sort((a, b) =>
  etoIndex.indexOf(a.eto) - etoIndex.indexOf(b.eto),
);

sort()は1か-1を返す使い方しか知りませんでした!

参考:Array.prototype.sort() - JavaScript | MDN

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