javascript - 处理对象操作数组

Question

下面我有一个对象数组

var data = [{
  "time": "1572024707.4763825",
  "rssi": "32",
  "id": "77777"
}, {
  "time": "1572024709.0991757",
  "rssi": "32",
  "id": "77777"
}, {
  "time": "1572024704.4570136",
  "rssi": "32",
  "id": "555555"
}, {
  "time": "1572024708.3903246",
  "rssi": "32",
  "id": "77777"
}, {
  "time": "1572024699.7132683",
  "rssi": "32",
  "id": "66666"
}]

如何重组它以删除时间最早的重复 ID

我尝试从数组中提取所有唯一 ID，以便可以循环访问数据数组，但代码开始变得太长。

  data.forEach(item => {

    IDs.push(item.id);
  });

  var unqIDs = [...new Set(IDs)];
  console.log(unqIDs);

输出应如下所示

outPutShouldBe = [{
  "time": "1572024699.7132683",
  "rssi": "32",
  "id": "66666"
},{
  "time": "1572024709.0991757",
  "rssi": "32",
  "id": "77777"
},  {"time": "1572024704.4570136",
  "rssi": "32",
  "id": "555555"
}
]

Answer 1

创建一个将 id 映射到具有该 id 的项目的最早时间的对象:

var keydata = {};
data.forEach(item=>{ 
    var p = keydata[item.id]; 
    if ( !p || p.time>item.time ) { 
        keydata[item.id] = item; 
    }});

现在收集该对象中的值:

var newdata = [];
for ( var k in keydata ) { 
    newdata.push(keydata[k]);
}

或更优雅的(谢谢，@TulioF。):

var newdata = Object.values(keydata)