example_1_let.js

exports.fn1 = function(){
    'use strict';
    
    console.log('Example 1 - use of let in blocks');
    
    let a = 10;
    
    function test() { //new scope, TDZ
        
        //console.log(a); //throws reference error
        
        let a = 20;
        
        console.log(a); // prints 20
        
        {
            console.log(a); // prints 20
            
            a = 40; //change in assignment
            
            console.log(a); // prints 40
            
        }
        
        console.log(a); //prints 40, the value of the variable is changed in the block
    }
    
    test();
    
    console.log(a); //prints 10
    
};