Javascript 按 2 个属性排序和筛选数组

Question

我想按日期保留最高分列表：

即

姓名：玩家 A |成绩： 2000 |日期： 2020-04-15

姓名：球员B|成绩： 2001 |日期： 2020-04-16

但是，我有时会得到更高的分数，但日期更低：

姓名：球员A|成绩： 2000 |日期： 2020-01-12

姓名：球员B|成绩： 2001 |日期： 2019-12-20

// should only return: a and c in order.

let arr = [

{name: c, score: 6, date: 5-20-2021},

{name: b, score: 2, date: 5-20-2020},

{name: a, score: 3, date: 5-20-2019}

]

arr.sort((a, b) => (a.score > b.score) ? 1 : -1)

arr.filter((a, b) => (a.submitted > b.submitted) ? 1 : -1)

Answer 1

只需在排序时输入这两个条件：<script>let arr = [{name: "i", score: 16, date: 2-20-2021},{name: "h", score: 6, date: 5-25-2021},{name: "g", score: 6, date: 5-20-2022},{name: "f", score: 6, date: 5-10-2021},{name: "e", score: 16, date: 5-20-1021},{name: "d", score: 6, date: 5-20-2001},{name: "c", score: 6, date: 5-20-2021},{name: "b", score: 2, date: 5-20-2020},{name: "a", score: 3, date: 5-20-2019}]arr.sort((a, b) => (a.score < b.score) && (a.date < b.date) ? 1 : -1)console.log(arr)</script>

Answer 2

filter 方法提供三个参数：当前元素当前元素的索引数组因此，您尝试将提交的与未定义进行比较。如果需要从排序数组中获取两个元素，则可以使用拼接方法arr.sort((a,&nbsp;b)&nbsp;=>&nbsp;b.score&nbsp;-&nbsp;a.score).splice(0,&nbsp;2)