choice.js - OOP Either

choice.js

 const choice = (decision) => {
  let yes = () => {};
  let no = () => {};
  const a = {
    yes: (f) => { yes = f; return a; },
    no: (f) => { no = f; return a; },
    decide: () => {
      const next = decision() ? yes() : no();
      return next.decide ? next.decide() : next;
    }
  };
  return a;
};