🔰lexical scope

JavaScript's scope system is called "lexical scope"

JS ⟩ concepts ⟩ scope ⟩ lexical scope

🈯 synonyms： "static scope"

JavaScript's scope is determined at compile time; the term for this kind of scope is "lexical scope". ("lexical" is associated with the lexing stage of compilation)

👉 compare： static vs. dynamic scoping

👥 相關

• scope / scope chain

• lexical environment

⭐️ 重點

JavaScript is largely lexically scoped, meaning that functions can access variables defined in their surroundings. 👉 see： RingoJS

• static scope： C, Java, JavaScript, Python and Ruby.

• dynamic scope： Perl.

📗 參考

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

• Wikipedia ⟩ lexical scope vs. dynamic scope

• ringojs ⟩ Understanding module and global scope ⭐️

• Anil ⟩ Scope, Lexical Environment and Scope Chain in JavaScript ⭐️