JS: Function Name Hoisting

Function Declaration Hoist Name and Value

• Function declaration implicitly move (aka hoist) the function name and definition to the top.
• Function expression assigned to variable only hoist the name, not the definition. (in Deno, neither.)

Compare:

console.log(f() === 3);

function f() {
  return 3;
}

// deno
// error: Uncaught ReferenceError: Cannot access 'g' before initialization
g();
const g = function () {
  return 3;
};