筛选和组合具有相同属性的对象数组中的索引

function filterAndCombineIndexes(objects, property) {
  const indexMap = {};
  
  for (let i = 0; i < objects.length; i++) {
    const obj = objects[i];
    const value = obj[property];
    
    if (value in indexMap) {
      indexMap[value].push(i);
    } else {
      indexMap[value] = [i];
    }
  }
  
  return indexMap;
}

// 示例用法
const objects = [
  { id: 1, category: 'A' },
  { id: 2, category: 'B' },
  { id: 3, category: 'A' },
  { id: 4, category: 'C' },
  { id: 5, category: 'B' }
];

const indexes = filterAndCombineIndexes(objects, 'category');
console.log(indexes);