greenweb

class User {
  constructor(...args) {
    args.forEach(elem => this[elem] = elem)
  }

  get(blabla) {
    return this[blabla];
  }
}

let a;
let b;
let c;

let obj; {
  a = 0;
  b = "+";
  c = "gvfbd";
  obj = new User(a, b, c);
}

console.log(obj[a])
console.log(obj.get(a))