怎样用js或者java对list集合判断有部分重复元素就筛选掉

Question

`[{time："2019-08-05 00:00:05",latitude: 20.678, longitude: 111.551, strength: 32.6}
{time："2019-08-05 00:00:05",latitude: 39.844, longitude: 109.942, strength: -35.8}
{time："2019-08-05 00:00:05",latitude: 39.879, longitude: 109.92, strength: -32.9}]`

比如这样一个list集合，如果latitude和longtitude是一样的，就取最新的时间，没想到怎么做才比较好。。。用js在前台或者java在后台都可以

Answer 1

list.filter(
  (a, _, arr) =>
    a ===
    arr
      .filter(b => (b.latitude === a.latitude) && (b.longitude === a.longitude))
      .sort(
        (v1, v2) => new Date(v2.time).getTime() - new Date(v1.time).getTime()
      )[0]
);