📘function declaration instantiation

🚧 under construction

JS ⟩ value ⟩ function ⟩ declaration ⟩ instantiation

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⭐️ 重點

⭐ function declaration instantiation

When an execution context is established for evaluating a function：

• a new Function Environment Record is created.

• bindings for each parameter are instantiated in that Environment Record.

• body declarations are also instantiated：

  • ⭐ if the parameters do not include any default value initializers： the body declarations are instantiated in the same Environment Record as the parameters❗(👉 parameter scope)

  • ⭐ if default value initializers exist：

    a second Environment Record is created for the body declarations❗

• parameter(s) / function(s) are initialized as part of FunctionDeclarationInstantiation. All other bindings are initialized during evaluation of the function body.

📘 JS spec ⟩ FunctionDeclarationInstantiation

👥 相關

📘 手冊

📗 參考

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