let con variable code example

Example 1: var vs let js

let: //only available inside the scope it's declared, like in "for" loop, 
var: //accessed outside the loop "for"

Example 2: let javascript

var i = "global";
function foo() {
    var i = "local"; // Otra variable local solo para esta función
    console.log(i); // local
}
foo();
console.log(i); // global