what is let in js 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 in javascript

The let statement declares a block scope local variable, optionally initializing it to a value.

let x = 1;

if (x === 1) {
  let x = 2;

  console.log(x);
  // expected output: 2
}

console.log(x);
// expected output: 1

Example 3: vars with let in it javascript

let /*Var name*/ = /*what is equals*/

Example 4: let javascript

The let statement declares a block-scoped local variable, 
  optionally initializing it to a value.
let x=1;

Example 5: 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