fix(loop): for...in文についてのES2020の変更点を反映 #1194
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azu
changed the title
azu
commented
Jun 28, 2020
| @@ -317,7 +317,7 @@ const filteredArray = array.filter((currentValue, index, array) => { | |||
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| ## for...in文 {#for-in-statement} | |||
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| for...in文はオブジェクトのプロパティに対して、順不同で反復処理を行います。 | |||
| for...in文はオブジェクトのプロパティに対して、反復処理を行います。[^1] | |||
azu
commented
Jun 28, 2020
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for...in文がプロパティを列挙する順番はES2019までは実装依存だった。これがES2020では仕様として列挙する順番が規程されたので、異なる列挙をするブラウザは基本的になくなる。(現時点ではすでにどのブラウザも同じ順番)
背景としては、
Reflect.ownKeys(ES2015)が入った際に大体の実装が同じ列挙順に統一されたため、仕様が修正された。詳細
fix #1180