Faster initialization of instances with new class features · V8

Show navigation Class fields have been shipped in V8 since v7.2 and private class methods have been shipped since v8.4. After the proposals reached stage 4 in 2021, work had begun to improve the support of the new class features in V8 - until then, there had been two main issues affecting their adoption: The initialization of class fields and private methods was much slower than the assignment of

[mattn]

クラスフィールドの初期化が改善されてるけど super() の呼び出し位置には気を付けろという話。

[efcl]

V8でPublic/Private Class Fieldが通常のプロパティと同等のパフォーマンスとなった。 仕様ではインスタンスに紐づけられるが、V8の実装ではクラスに紐づいたContextへ保存されている。