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I used the let keyword inside the block.As I called the function within the block only.Why the error came.

I used the let keyword inside the block.As I called the function within the block only.Why the error came.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Sir,I practiced one javascript code.The code is below:

<html>

<head>  

  <script>    

  var g=6;    

  if(g==6){       

let j=9;      

  u();       

document.write(j);   

   }

   function u(){    

j++;  

}

   </script> 

</head>

    <body>        </body>

</html>

For this the output is:

Uncaught ReferenceError: j is not defined

I used the let keyword inside the block.As I called the function within the block only.Why the error came.

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