Example Scope in Js

Clousure Example Js

function operacionescon(number){
    let first_number = number

    return {
        suma: function (other_number){
            return first_number + other_number
        },
        resta:function(other_number){
            return first_number - other_number
        },
        multiplica: function (other_number){
            return first_number * other_number
        },
        divide:function (other_number){
            return first_number / other_number
        }
    }
}

let operocon2 = operacionescon(2)
console.log(operocon2.suma(3))
console.log(operocon2.resta(3))
console.log(operocon2.multiplica(3))
console.log(operocon2.divide(3))

Scope js

// Scope global

let var1 = 'Hola';
const var2 = 'Hi';

// function Scope
function scope(number) {
  if (number >= 3) {
    // block scope
    //Re-escribir la variable var1 porque se definió con let
    var1='La multiplicación da'
    let number_two = 100;
    return console.log(`${var1} ${number * number_two}`);
  } else {
    // block scope
    // No se puede re-escribir var2, porque se definió con const
    //var2='la suma es ahora'
    let number_three = 200;
    return console.log(`${var2} ${number + number_three}`);
  }
}