--description--

A variable declared inside a function is only visible inside a function. This is called the scope of the variable, this particular scope is called the local scope. Variables declared outside of a function are called global variables and are visible throughout the program. For example, the following code will raise an error:

function myFunction() {
  let x = 10;
}

console.log(x);

The variable x is declared inside the function myFunction and is not visible outside of the function. The code will raise a ReferenceError because x is not defined.

If you declare a variable outside of a function, it is called a global variable and is visible throughout the program. For example, the following code will work:

let x = 10;

function myFunction() {
  console.log(x);
}

myFunction();

If a same-named variable is declared inside the function then it shadows the outer one.

--questions--

--text--

What will be the output of the following code?

let x = 10;

function myFunction() {
  let x = 20;
  console.log(x);
}

myFunction();

--answers--

10

20

--video-solution--

2