基于属性合并对象数组内部数组

function mergeArraysByProperty(arr, property) {
  return arr.reduce((result, obj) => {
    const value = obj[property];
    if (result.hasOwnProperty(property)) {
      result[property].push(value);
    } else {
      result[property] = [value];
    }
    return result;
  }, {});
}

// 示例数据
const data = [
  { id: 1, name: 'A', category: 'X' },
  { id: 2, name: 'B', category: 'Y' },
  { id: 3, name: 'C', category: 'X' },
  { id: 4, name: 'D', category: 'Z' },
  { id: 5, name: 'E', category: 'Y' }
];

// 按照 category 属性合并数组
const mergedData = mergeArraysByProperty(data, 'category');
console.log(mergedData);

{
  X: [ 'X', 'X' ],
  Y: [ 'Y', 'Y' ],
  Z: [ 'Z' ]
}