**Hoisting** is Javascript's default behavior of moving all declarations to the top of their functional scope.


# Hoisting variables
The basic programming fundamental of many languages is to declare a variable and then initialize it; however, JavaScript works differently. JS _hoists_ the declaration of a variable up and allows it to be used. This way, a variable can be declared after it has been used.


var a = 1;
var b = 2;
var c = 3;

console.log(a + " " + b + " " + c);

The above code runs as expected, printing the values of `a`, `b` and `c` in chronological order. However, what happens when we declare a variable after the console log?

var a = 1;
var b = 2;
c = 3;

console.log(a + " " + b + " " + c);

var c;

We get the same result. The code above is a simple example of hoisting where the variable declaration of `c` is brought to the top of the code and assigned the value of `3`.  What happens when we initialize `c` and assign its value after the console log?

var a = 1;
var b = 2;

console.log(a + " " + b + " " + c);

var c = 3;

As you can see, we get an `undefined` value. This is because hoisting only moves up declarations, not value assignments. So, when the console logs, `c` will have been initialized, but will not yet have been assigned a value. 

# Hoisting functions
Hoisting works for functions as well.

func();

function func() {
    var a = 1;
    var b = 2;
    var c = 3;
    console.log(a + " " + b + " " + c);
}

While hoisting can sometimes be useful, it will also slow down the loading speed of the browser; so, it's important to be careful when using this functionality.

What is Javascript hoisting?

Hoisting is Javascript s default behavior of moving all declarations to the top of their functional scope. Hoisting variables The basic programming fundamental of many languages is to declare a variable and then initialize it; however, JavaScript works differently. JS hoists the declaration of a variable up and allows it to be used. This way, a variable can be declared after it has been used. 