javascript - 如何过滤带有多个参数的json对象？

Question

以下是每几分钟10台设备的记录。我需要为每个 id 返回唯一的记录集，并且每个 id 都应该只是最新的。

我怎样才能用 Elasticsearch 或任何其他解决方案来做到这一点？

{
    {id: 1, time: 12345}, 
    {id: 2, time: 12346}, 
    {id: 1, time: 12347}, 
    {id: 2, time: 12348}, 
    {id: 1, time: 12349}, 
    {id: 3, time: 12350}, 
    ... // 10 different ids and 10000 records
}

Answer 1

这是我所能得到的最接近的结果。如果您在原始数据集中有超过 10 个唯一 ID，则不确定如何选择返回哪 10 个结果。

var rawData = [
    {id: 1, time: 12345}, 
    {id: 2, time: 12346}, 
    {id: 1, time: 12347}, 
    {id: 2, time: 12348}, 
    {id: 1, time: 12349}, 
    {id: 3, time: 12350}, 
    {id: 4, time: 12351}, 
    {id: 2, time: 12352}, 
    {id: 7, time: 12353}, 
    {id: 5, time: 12354}, 
    {id: 3, time: 12355}, 
    {id: 6, time: 12356}, 
    {id: 3, time: 12357}, 
    {id: 7, time: 12358}, 
    {id: 6, time: 12359}, 
    {id: 9, time: 12360}
]

var maxSet = {};
// Get all of the max values
rawData.forEach(function (currentValue, index, array) {
  var currentMax = maxSet[currentValue.id] || null;
  if(currentMax) {
    if(currentValue.time > currentMax){
      maxSet[currentValue.id] = currentValue.time;
    }
  } else {
    maxSet[currentValue.id] = currentValue.time;
  }
});
console.log(maxSet);
// Convert back to object if necessary
var keys = Object.keys(maxSet);
var resultObjs = [];
for(var key in keys) {
    resultObjs.push({id: keys[key], time: maxSet[keys[key]]});
}
console.log(resultObjs);