如何从复杂的对象数组中获得唯一的对象数组? [英] How to get unique an array of objects back from a complex an array of objects?

问题描述

如何从字段input[i].user

我可以编写一个for循环，但想知道是否有使用filter/set等的更短方法?谢谢

I can write a for loop but wanted to know if there is a shorter way using filter/set etc ? Thanks

const input = [{
  "id": 133557,
  "user": "bcasey1",
  "userfullname": "Bertha Casey",
  "commentTypeId": 2,
  "annotationPrimaryId": 141614,
  "comment": "Red color on ravioli is not true, fix",
  "deleted": false,
  "historyno": "133557-0",
  "timestamp": "Tue Apr 24 10:40:42 CDT 2018",
  "type": "rectangle"
}, {
  "id": 134038,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 1,
  "annotationPrimaryId": 142286,
  "comment": "test123",
  "deleted": false,
  "historyno": "134038-0",
  "timestamp": "Mon Jul 8 22:15:18 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134039,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 2,
  "annotationPrimaryId": 142287,
  "comment": "test234",
  "deleted": false,
  "historyno": "134039-0",
  "timestamp": "Mon Jul 8 22:15:35 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134112,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 3,
  "annotationPrimaryId": 142361,
  "comment": "sadasdasd",
  "deleted": false,
  "historyno": "134112-0",
  "timestamp": "Wed Jul 17 13:03:55 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134112,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 0,
  "annotationPrimaryId": 142370,
  "comment": "sadasdasd s",
  "deleted": false,
  "historyno": "134112-1",
  "timestamp": "Wed Jul 17 15:09:48 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134113,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 4,
  "annotationPrimaryId": 142362,
  "comment": "sadasdasd edited #4",
  "deleted": false,
  "historyno": "134113-0",
  "timestamp": "Wed Jul 17 13:16:39 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134114,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 0,
  "annotationPrimaryId": 142363,
  "comment": "sadasdasd edited #5",
  "deleted": false,
  "historyno": "134114-0",
  "timestamp": "Wed Jul 17 13:20:06 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134114,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 0,
  "annotationPrimaryId": 142365,
  "comment": "sadasdasd edited #6",
  "deleted": false,
  "historyno": "134114-1",
  "timestamp": "Wed Jul 17 13:36:53 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134114,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 0,
  "annotationPrimaryId": 142366,
  "comment": "sadasdasd edited #7",
  "deleted": false,
  "historyno": "134114-2",
  "timestamp": "Wed Jul 17 13:46:36 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134115,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 2,
  "annotationPrimaryId": 142367,
  "comment": "eertet",
  "deleted": false,
  "historyno": "134115-0",
  "timestamp": "Wed Jul 17 14:50:03 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134118,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 3,
  "annotationPrimaryId": 142371,
  "comment": "a",
  "deleted": false,
  "historyno": "134118-0",
  "timestamp": "Wed Jul 17 15:09:58 CDT 2019",
  "type": "rectangle"
}];

const expectedOutput = [{
  "user": "bcasey1",
  "userfullname": "Bertha Casey"
}, {
  "user": "admin",
  "userfullname": "Administrator Administrator",
}];

console.log('expectedOutput', expectedOutput);

推荐答案

或者，您可以map到简化的"user"，"userfullname"对象，然后filter到索引与结果相同的位置findIndex其中用户"相等(一种用于javascript数组的唯一方法)

Alternative, you could map to the simplified "user", "userfullname" object then filter on where the index is the same as the result of findIndex where "user" is equal (a way to unique for javascript arrays)

const input = [{
  "id": 133557,
  "user": "bcasey1",
  "userfullname": "Bertha Casey",
  "commentTypeId": 2,
  "annotationPrimaryId": 141614,
  "comment": "Red color on ravioli is not true, fix",
  "deleted": false,
  "historyno": "133557-0",
  "timestamp": "Tue Apr 24 10:40:42 CDT 2018",
  "type": "rectangle"
}, {
  "id": 134038,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 1,
  "annotationPrimaryId": 142286,
  "comment": "test123",
  "deleted": false,
  "historyno": "134038-0",
  "timestamp": "Mon Jul 8 22:15:18 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134039,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 2,
  "annotationPrimaryId": 142287,
  "comment": "test234",
  "deleted": false,
  "historyno": "134039-0",
  "timestamp": "Mon Jul 8 22:15:35 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134112,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 3,
  "annotationPrimaryId": 142361,
  "comment": "sadasdasd",
  "deleted": false,
  "historyno": "134112-0",
  "timestamp": "Wed Jul 17 13:03:55 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134112,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 0,
  "annotationPrimaryId": 142370,
  "comment": "sadasdasd s",
  "deleted": false,
  "historyno": "134112-1",
  "timestamp": "Wed Jul 17 15:09:48 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134113,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 4,
  "annotationPrimaryId": 142362,
  "comment": "sadasdasd edited #4",
  "deleted": false,
  "historyno": "134113-0",
  "timestamp": "Wed Jul 17 13:16:39 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134114,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 0,
  "annotationPrimaryId": 142363,
  "comment": "sadasdasd edited #5",
  "deleted": false,
  "historyno": "134114-0",
  "timestamp": "Wed Jul 17 13:20:06 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134114,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 0,
  "annotationPrimaryId": 142365,
  "comment": "sadasdasd edited #6",
  "deleted": false,
  "historyno": "134114-1",
  "timestamp": "Wed Jul 17 13:36:53 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134114,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 0,
  "annotationPrimaryId": 142366,
  "comment": "sadasdasd edited #7",
  "deleted": false,
  "historyno": "134114-2",
  "timestamp": "Wed Jul 17 13:46:36 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134115,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 2,
  "annotationPrimaryId": 142367,
  "comment": "eertet",
  "deleted": false,
  "historyno": "134115-0",
  "timestamp": "Wed Jul 17 14:50:03 CDT 2019",
  "type": "rectangle"
}, {
  "id": 134118,
  "user": "admin",
  "userfullname": "Administrator Administrator",
  "commentTypeId": 3,
  "annotationPrimaryId": 142371,
  "comment": "a",
  "deleted": false,
  "historyno": "134118-0",
  "timestamp": "Wed Jul 17 15:09:58 CDT 2019",
  "type": "rectangle"
}];

const simpleInput = input.map(({ user, userfullname }) => ({ user, userfullname }));

const filteredInput = simpleInput.filter((user, i, a) => i == a.findIndex(u => u.user == user.user));

console.log(filteredInput)

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