04-default-params.js

function newUser(name, age, country) {
  var name = name || 'Oscar';
  var age = age || 34;
  var country = country || 'MX';
  console.log(name, age, country);
}

newUser();
newUser('David', 15, 'CO');

function newAdmin(name = 'Oscar', age = 32, country = 'CL') {
  console.log(name, age, country);
}

newAdmin();
newAdmin('Ana', 28, 'PE');