const make_something = (...params) => {
  const private_var = 42

  return {
    params,
    get_var: () => private_var
    log_params() {
      console.log(this.params)
    }
  }
}

const something = make_something(5)
console.log(something.get_var())
console.log(something.params)
something.log_params()