the monorail monad. every time you bind it logs that the shiny glaceon has gotten a little big larger

class Monorail {
  #value;
  #size = 1;

  constructor(value) {
    this.#value = value;
  }

  bind(f) {
    const newThis = f(this.#value);

    if (newThis.#size < this.#size + 1) newThis.#size = this.#size + 1;
    console.log(`the glaceon is now ${newThis.#size} meters tall`);
  return newThis;
  }
};