JSES6-02

var ABC = 10;

function XXX (number1, number2 = ABC) {
  return number1 === number2;
}

console.log(XXX(10));

function XXX2 (a, b=3) {
  return a + b;
}

XXX2(3);
XXX2(3,10);

console.log("<-------------------->");

let name = "Marco";
let age = 35;

let OBJ = {
  name,
    age,
  greet () {
    console.log(this.name + " " + this.age);
  },
}

console.log(OBJ);
OBJ.greet();