❗reserved word as property name is allowed❗️

JS ⟩ grammar ⟩ keyword ⟩ reserved word ⟩ as property name is allowed❗

reserved word can be used as property name❗

const obj = { var: 'joe' };    // ❗️ "var" is reserved word
obj.var;                       // ⭐️ 'joe'

📘 手冊

• Lexical grammar ⟩ keywords ⟩ reserved words

• SyntaxError: "x" is a reserved identifier

• ECMA spec ⟩ 12.6.2 Keywords and Reserved Words ⟩ Reserved Words ⭐️

📗 參考