json数据检查是否重复相同的ID [英] json data check if same id repeat

问题描述

我有一个json数据，其中一个id具有不同的color_id. 所以从那里我只想检查是否重复相同的ID，然后只保留第一个

I have a json data there one id has different color_id. So from there I just want to check if same id repeat then just keep first one

这是我的示例JSON

Here is my sample JSON

var data= [{ "id": "1", "name": "xxx", "age": "22","color_id": "22" },
    { "id": "1", "name": "yyy", "age": "15","color_id": "1" },
    { "id": "5", "name": "zzz", "age": "59","color_id": "22" }];

我想要的输出

var data= [{ "id": "1", "name": "xxx", "age": "22","color_id": "22" },
    { "id": "5", "name": "zzz", "age": "59","color_id": "22" }];

我尝试过reduce，但是我发现在那里修改了数据结构，所以我不确定是否会得到所需的输出.

I tried reduce but there I found that modify data structure so I am not sure that I will get my desired output or not.

推荐答案

var data = [{
    "id": "1",
    "name": "xxx",
    "age": "22",
    "color_id": "22"
  },
  {
    "id": "1",
    "name": "yyy",
    "age": "15",
    "color_id": "1"
  },
  {
    "id": "5",
    "name": "zzz",
    "age": "59",
    "color_id": "22"
  }
];

let map = {};
let uniqueEntries = data.filter((el) => map[el.id] ? false : map[el.id] = true);
console.log(uniqueEntries )

说明:

1. 您创建了一个用于存储ID的地图.
2. 然后过滤数组，每次我们找到不在地图中的条目时，都会将其添加到列表中并返回true.如果我们已经在列表中添加了它，则返回false以丢弃该条目.

条件的最后一部分使用赋值返回赋值的事实.

the last part of the conditional is using the fact that an assignment returns the assigned value.

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