🔸class field

JS ⟩ class ⟩ definition ⟩ class fields

class fields 指寫在 class definition 中，但在 constructor() 外面的 instance properties。據說這種新語法是為了改良原有的constructor()語法，讓物件屬性更突出、更易於集中管理而設計的做法。

In the context of classes, MDN Web Docs content uses the terms properties and fields interchangeably.

⭐️ 重點

class fields are defined on the instance, not on the prototype.

👉 MDN ⟩ arrow functions used as methods

The class fields are initialized:

• base class: before constructor()

• derived class: immediately after super()

👉 更詳細內容，請看： override class fields

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