如何有条件地创建带约束的obj

const shouldAddProperty = true; // 这个值可以是任何条件表达式的结果

const obj = {
  name: 'Alice',
  ...(shouldAddProperty && { age: 25 })
};

console.log(obj); // 输出: { name: 'Alice', age: 25 }

function createPerson(name, shouldAddAge) {
  const person = { name };
  if (shouldAddAge) {
    person.age = 25;
  }
  return person;
}

const person1 = createPerson('Bob', false);
console.log(person1); // 输出: { name: 'Bob' }

const person2 = createPerson('Charlie', true);
console.log(person2); // 输出: { name: 'Charlie', age: 25 }

class Person {
  constructor(name, shouldAddAge) {
    this.name = name;
    if (shouldAddAge) {
      this.age = 25;
    }
  }
}

const person1 = new Person('David', false);
console.log(person1); // 输出: Person { name: 'David' }

const person2 = new Person('Eve', true);
console.log(person2); // 输出: Person { name: 'Eve', age: 25 }