function tuple (a, b) {
  return function (i) {
    if (i === 0) return a;
    if (i === 1) return b;
  }
}

function car (t) {
  return t(0);
}

function cdr (t) {
  return t(1);
}

const me = tuple('alex', 'alonso');

const firstName = car(me);
const lastName = cdr(me);

console.log(firstName + ' ' + lastName);