将对象中相同的id合并为一个对象数组

function mergeObjectsById(objects) {
  const mergedObjects = {};
  
  objects.forEach(obj => {
    const id = obj.id;
    
    if (mergedObjects[id]) {
      // 合并对象
      Object.assign(mergedObjects[id], obj);
    } else {
      // 添加新对象
      mergedObjects[id] = obj;
    }
  });
  
  // 将合并后的对象转换为数组
  const mergedArray = Object.values(mergedObjects);
  
  return mergedArray;
}

// 示例用法
const objects = [
  { id: 1, name: 'Object 1', value: 10 },
  { id: 2, name: 'Object 2', value: 20 },
  { id: 1, name: 'Object 3', value: 30 },
  { id: 3, name: 'Object 4', value: 40 }
];

const mergedArray = mergeObjectsById(objects);
console.log(mergedArray);

[
  { id: 1, name: 'Object 3', value: 30 },
  { id: 2, name: 'Object 2', value: 20 },
  { id: 3, name: 'Object 4', value: 40 }
]