let in js

1. as Douglas Crockford has said, the worst feature of JavaScript is global variables.
   This has been alleviated greatly by block scoped variables
   
   consider the following
   
   
   var test ="herman"
   
   {
   test ="boris";
   console.log(test)
   }
   console.log(test)
   
   or
   
   
   var test ="herman"
   
   {
   var test ="boris";
   console.log(test)
   }
   console.log(test)
   
   the result will be
   
   
   boris
   boris
   
   However, with the new let keyword
   
   var test ="herman"
   
   {
   let test ="boris";
   console.log(test)
   }
   console.log(test)
   
   the results are now
   boris
   herman