Javascript function scoping and hoisting

Question

I just read a great article about JavaScript Scoping and Hoisting by Ben Cherry in which he gives the following example:

var a = 1;

function b() {
    a =          


        

Answer 1

From my piece of knowledge, hoisting happens with the variable declaration and function declaration, for example:

a = 7;
var a;
console.log(a) 

What happens inside JavaScript's engine:

var a;
a = 7;
console.log(a);
// 7

Or:

console.log(square(7)); // Output: 49
function square(n) { return n * n; }

It will become:

function square(n) { return n * n; }
console.log(square(7)); // 49

But assignments such as variable assigment, function expression assignment will not be hoisted: For example:

console.log(x);
var x = 7; // undefined

It may become like this:

var x;
console.log(x); // undefined
x = 7;