使用lodash按两个变量对对象数组进行分组

const _ = require('lodash');

const data = [
  { id: 1, category: 'A', type: 'X' },
  { id: 2, category: 'B', type: 'Y' },
  { id: 3, category: 'A', type: 'Y' },
  { id: 4, category: 'C', type: 'X' },
  { id: 5, category: 'B', type: 'X' },
  { id: 6, category: 'C', type: 'Y' }
];

const result = _.groupBy(data, (obj) => obj.category + obj.type);

console.log(result);

{
  AX: [
    { id: 1, category: 'A', type: 'X' }
  ],
  BY: [
    { id: 2, category: 'B', type: 'Y' }
  ],
  AY: [
    { id: 3, category: 'A', type: 'Y' }
  ],
  CX: [
    { id: 4, category: 'C', type: 'X' }
  ],
  BX: [
    { id: 5, category: 'B', type: 'X' }
  ],
  CY: [
    { id: 6, category: 'C', type: 'Y' }
  ]
}