FunctionsCannotBeImmediatelyInvoked

DRAFT

Correction

Here is what's right.

There are two ways to define a function:

• through a function declaration:

    function foo(){}; // function declaration
    () => {} // arrow function declaration

• through a function expression:

    // function expressions
    (function foo(){});
    const foo = function(){};
    const bar = { foo: function(){} }
  
    // arrow function expressions
    (() => {});
    const foo = () => {};
    const bar = { foo: () => {} }

Function declarations cannot be immidiately invoked:

Function expressions can be invoked as they are defined:

Difficult cases

Internal scope

Function expressions can be named, meaning that it is possible to access the function from within its own scope:

Function expressions are not function declarations

A function expression does not declare the function in the containing scope of the expression.