[javascript][iterable object]如何在类似数组的可迭代对象中汇总特定键的值

// 定义一个类似数组的可迭代对象
const iterableObject = {
  0: { key: 'A', value: 10 },
  1: { key: 'B', value: 20 },
  2: { key: 'C', value: 30 },
  length: 3,
  [Symbol.iterator]: function() {
    let index = 0;
    const keys = Object.keys(this).filter(key => !isNaN(Number(key)));
    return {
      next: () => ({
        value: this[keys[index++]],
        done: index > keys.length
      })
    };
  }
};

// 使用reduce()方法汇总特定键的值
const sum = Array.from(iterableObject).reduce((accumulator, current) => {
  return accumulator + current.value;
}, 0);

console.log(sum); // 输出60，即10 + 20 + 30