javascript - 根据另一个对象更新对象属性数组

Question

我想通过查找两支球队的 id 来根据另一个对象数组(比赛结果)更新一个对象数组(联赛表)，并更新联赛表上的统计数据，

就像足球排行榜的运作方式一样。

这就是联赛排名的样子

let leagueStandings = [
  {id:'49e93e0d', played: 0, scored: 0, conceded: 0, won: 0, drawn: 0, lost: 0},
  {id:'24e5ddb8', played: 0, scored: 0, conceded: 0, won: 0, drawn: 0, lost: 0}
]

我得到了两支球队的比赛结果对象数组，我需要更新联赛排名。

let matchResult = [
  { id: '49e93e0d', scored: 2, conceded: 1, win: true, draw: false },
  { id: '24e5ddb8', scored: 1, conceded: 2, win: false, draw: false }
]

所以我想出了这段代码

function updateStandings(match) {
    let team;
    match.forEach(prop => { //loop both teams in result and update their respective stats
        team = leagueStandings.find(team => team.id === prop.id); // find the team to update by id
        team.played++
        team.scored += prop.scored
        team.conceded += prop.conceded
        team.goalDifference += (prop.scored - prop.conceded)
        if (prop.win) team.won++
        if (prop.draw) team.drawn++
        if (!prop.win && !prop.draw) team.lost++
    });
}

updateStandings(matchResult)

// outputs the expected the result
[
  { id: '49e93e0d', played: 1, scored: 2, conceded: 1, won: 1, drawn: 0, lost: 0 },
  { id: '24e5ddb8', played: 1, scored: 1, conceded: 2, won: 0, drawn: 0, lost: 1 }
]

哪个确实有效并且可以完成工作，但是我认为有更好的方法来做到这一点？而且联赛积分榜数组将包含大量球队，所以我不确定这是否是最好的方法？

预期输出

[
  { id: '49e93e0d', played: 1, scored: 2, conceded: 1, won: 1, drawn: 0, lost: 0 },
  { id: '24e5ddb8', played: 1, scored: 1, conceded: 2, won: 0, drawn: 0, lost: 1 }
]

完整代码HERE

Answer 1

解决方案中的 find() 函数将遍历每个 leagueStandings 项目以匹配 id

因为 leagueStandings 平均而言是无序的，因此在找到匹配项之前必须循环遍历一半的项目。

这可以通过按 ID 建立索引来修复

考虑在leagueStandings中使用此结构:

let leagueStandings = {
  '49e93e0d': {played: 0, scored: 0, conceded: 0, won: 0, drawn: 0, lost: 0},
  '24e5ddb8': {played: 0, scored: 0, conceded: 0, won: 0, drawn: 0, lost: 0}
}

现在您可以更改此行:

team = leagueStandings.find(team => team.id === prop.id);

对此:

team = leagueStandings[prop.id];

并进行索引查找