回答編集履歴
3
オブジェクトに戻さないなら、groupByToMap がいいかな？
test
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@@ -1,4 +1,4 @@
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~~Array.prototype.groupBy()~~ `Array.prototype.groupByToMap`を使ってみました。
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```html
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<!DOCTYPE html>
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@@ -18,17 +18,15 @@
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[103, ["nakamura"]],
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]
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console.log(
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Object.entries(
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[...test.groupByToMap(([key,]) => key)].map(
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).map(
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([key, value]) => [key, value.flatMap(x => x[1])]
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)
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)
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+
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</script>
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</body>
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</html>
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```
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[Array.prototype.groupBy() - JavaScript | MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/groupBy)
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[core-js-bundle CDN by jsDelivr - A CDN for npm and GitHub](https://www.jsdelivr.com/package/npm/core-js-bundle)
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[Array.prototype.groupByToMap() - JavaScript | MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/groupByToMap)[core-js-bundle CDN by jsDelivr - A CDN for npm and GitHub](https://www.jsdelivr.com/package/npm/core-js-bundle)
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2
つい手拍子でオブジェクトにしてしまっていたのを修正
test
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@@ -18,12 +18,10 @@
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[103, ["nakamura"]],
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]
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console.log(
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Object.fromEntries(
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Object.entries(
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test.groupBy(([key,]) => key)
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-
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).map(
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-
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([key, value]) => [key, value.flatMap(x => x[1])]
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)
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)
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)
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</script>
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1
見やすくしよう。
test
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@@ -18,9 +18,14 @@
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[103, ["nakamura"]],
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]
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console.log(
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Object.fromEntries(
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Object.entries(
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test.groupBy(([key,]) => key)
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).map(
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-
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([key, value]) => [key, value.flatMap(x => x[1])]
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)
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)
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)
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-
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</script>
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</body>
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