如何按长度划分分组数组对象？

Question

我从数据库中检索了以下数据

var members = [
  { "name" : "a", "department_id" : 1, "department_name" : "aaa" },
  { "name" : "b", "department_id" : 1, "department_name" : "aaa" },
  { "name" : "c", "department_id" : 1, "department_name" : "aaa" },
  { "name" : "d", "department_id" : 1, "department_name" : "aaa" },
  { "name" : "e", "department_id" : 1, "department_name" : "aaa" },
  { "name" : "f", "department_id" : 2, "department_name" : "bbb" },
  { "name" : "g", "department_id" : 2, "department_name" : "bbb" }
];

第一步是按部门名称对这些数据进行分组。

var groupedMembers = _.groupBy(members, "department_name");

↓

{
  "aaa" : [
    { "name" : "a", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "b", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "c", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "d", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "e", "department_id" : 1, "department_name" : "aaa" }
  ],
  "bbb" : [
    { "name" : "f", "department_id" : 2, "department_name" : "bbb" },
    { "name" : "g", "department_id" : 2, "department_name" : "bbb" }
  ]
}

从这个状态开始，我想进一步将对象拆分为每三个对象。

理想情况下，我希望按以下方式格式化数组

var expected = {
  "aaa1" : [
    { "name" : "a", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "b", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "c", "department_id" : 1, "department_name" : "aaa" }
  ],
  "aaa2" : [
    { "name" : "d", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "e", "department_id" : 1, "department_name" : "aaa" }
  ],
  "bbb" : [
    { "name" : "f", "department_id" : 2, "department_name" : "bbb" },
    { "name" : "g", "department_id" : 2, "department_name" : "bbb" }
  ]
};

我可以使用 Underscore.js 或 lodash.js 解决这个问题吗？如果不是太难，你可以使用其他库或纯 javascript 实现。

谢谢。

Answer 1

您可以只使用纯 javascript 来实现。

var groupedMembers = {
  "aaa" : [
    { "name" : "a", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "b", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "c", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "d", "department_id" : 1, "department_name" : "aaa" },
    { "name" : "e", "department_id" : 1, "department_name" : "aaa" }
  ],
  "bbb" : [
    { "name" : "f", "department_id" : 2, "department_name" : "bbb" },
    { "name" : "g", "department_id" : 2, "department_name" : "bbb" }
  ]
}

var splitByThree = {}

for (const key in groupedMembers) {
  if (groupedMembers[key].length <= 3) {
    splitByThree[key] = groupedMembers[key]
  }
  else {
    for (var i=0, j=groupedMembers[key].length; i<j; i+=3) {
      splitByThree[key + (i+3)/3] = groupedMembers[key].slice(i, i+3);
    }
  }
}

那么 splitByThree 就是您的预期结果。

如何按长度划分分组数组对象？

How can I divide grouped array-object by length?

javascript

underscore.js