Find the output of given code snippet

Let’s take a look at the following JavaScript code:

    
      let x = 10;

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

      foo();
    
  

What do you think the output of this code snippet will be?

Now, let’s analyze the code:

When the foo function is called, it tries to log the value of x to the console. However, within the function, a new variable x is declared and assigned the value 20. This means that the value of x within the function is undefined at the time of the console log, as it is declared after the console.log(x) statement.

As a result, the output of the code will be undefined.

So, if you were asked this question in a JavaScript interview, now you know how to answer it!