🔸internal property

JS ⟩ value ⟩ object ⟩ property ⟩ internal property

for most operations on objects, there’s an “internal method” in the JS spec that describes how it works at the lowest level. For instance:

• [[Get]] - internal method to read a property

• [[Set]] - internal method to write a property

⚠️ these methods are only used in the spec, we can’t call them directly❗

⭐️ 重點

• ( not❓) every function supports the [[Call]] internal method.

• every constructor supports the [[Construct]] internal method.

👉 callable vs. constructable

🔴 主題

• ⚖️ callable vs. constructable

• [[Environment]] - lexical environment where a function was made.

• [[HomeObject]]

👥 相關

• Proxy

• mixin uses internal methods to get/set properties.

📗 參考

• JS.info ⟩ Proxy and Reflect