🈯declaration

🚧 under construction -> function*

JS ⟩ grammar ⟩ declaration

⭐️ only the following are (9) declarations：

• let / const ( ⚠️ var is a statement❗️)

• class / function,

• function*

• async function, async function*

• import / export (only appear at the top-level of a module)

⭐️ 重點

⭐ declarations and statements are different❗

👉 statement vs. declaration❗

statement vs. declaration

• var is a statement. (👉 var is a statement❗️)

• let/const is a declaration.

👉 statement expected❗️❗

in a module there's no "module scope object" for these top-level declarations to be added to as property.

( 👉 compare： global var / function is global object property❗️)

🔴 主題

🧨 雷區

👥 相關

📗 參考

📘 手冊

🚧