🔰as variable

🚧 施工中

JS ⟩ concepts ⟩ expression ⟩ function expression ⟩ as variable

💈範例

• replit：assign function expression to variable

// ⭐️ the variable to which the "function expression" is assigned:
// -----------------------------------------------------------------------------
//   • will have a `name` property
//   • the name won't change if it's assigned to a different variable.
//   • (implicit name) if function is anonymous, it will be the "variable name".
//   • (explicit name) if function is named, it will be the "function name".

// ⭐️ (anonymous) function expression
//        ╭──── ⭐️ ────╮
const f = function() { }; 
f.name                   // "f" (implicit name = variable name)

const f2 = f;
f2.name;                 // "f" (the `name` won't change❗)

// ⭐️ arrow function
//        ╭─ ⭐️ ─╮
const h = () => {};
h.name;                  // "h" (implicit name also applies to arrow functions)

// ⭐️ (named) function expression
//        ╭────── ⭐️ ───────╮
const g = function game() { };
g.name;                  // "game" (explicit name = function name)

typeof g;       // 'function'
typeof game;    // undefined (`game` is only scoped within the function body❗)

📘 手冊