Ejemplo crear objetos: puras funciones

.js

const calculateIMC = (height, weight) => {
  const imc = this.weight / Math.pow(this.height, 2).toFixed(2);
  if(imc < 16){
    return 'delgadez severa imc ' + imc;
  }
  if(imc < 16.99){
    return 'delgadez moderada imc ' + imc;
  }
  if(imc < 18.49){
    return 'delgadez aceptable imc ' + imc;
  }
  if(imc < 24.99){
    return 'peso normal imc ' + imc;
  }
  if(imc < 29.99){
    return 'sobrepeso imc ' + imc;
  }
  if(imc < 34.99){
    return 'Obeso tipo 1 imc ' + imc;
  }
  if(imc < 40){
    return 'Obeso Tipo 2 imc ' + imc;
  }
  return 'Obeso Tipo 3' + imc;
};

const createPerson = ({name, secondName, lastName, age, height, weight}) => {
  const getFullName = () => `${name} ${secondName} ${lastName}`;

  return {
    name,
    age,
    height,
    weight,
    getIMC: calculateIMC(height, weight),
    getFullName,
  }
}

const juan = createPerson(
  {
    name: 'Letsis',
    secondName: 'Yamaz', 
    lastName: 'Navarro', 
    age: 20, 
    height: 1.70, 
    weight: 80
  }
);

juan.getFullName(); //=> 'juan'
juan.getIMC; //=> 28.23345453

const calculateMonthlySalary = salary => salary * 30;

const Worker = ({person, salary}) => ({
  ...person,
  salary,
  monthlySalary: calculateMonthlySalary(salary),
});

const workerJuan = Worker({person: juan, salary: 100});

workerJuan.monthlySalary; // => 3000