const engine = {
  type: "V8",
  displacement: 4.0,
  getInfo() {
    return `${this.type} - ${this.displacement}L`;
  },
  turbo: {
    boost: 12,
    getBoost() {
      return `${this.type ?? "Unknown"} boosted at ${this.boost} psi`;
    },
  },
};

const detached = engine.getInfo;
const turboInfo = engine.turbo.getBoost;

console.log(engine.getInfo());
console.log(engine.turbo.getBoost());
console.log(turboInfo());