🔰environment record

🚧 under construction

JS ⟩ concepts ⟩ scope ⟩ lexical environment ⟩ environment record

an object that is part of a "lexical environment", it stores：

• all local variable(s) as its properties.

• other information like the value of this.

📗 JS.info ⟩ Lexical Environment

🗺️ 圖解

• Lexical Environments (linked together)

Lexical Environment(s)

• Environment Record Hierarchy (object graph)

Environment Record Hierarchy

⭐️ 重點

A "variable" is just a property of the environment record (associated with the currently executing block /function /module /script).

👥 相關

• ❗"this" determined on call site❗️

📗 參考

• YDKJS: Scope & Closures (v.2) ⟩ Ch. 1

• JS.info ⟩ Lexical Environment

📘 手冊

• JS spec ⟩ The Environment Record Type Hierarchy ⭐️