獲取對象數組中最大值的索引

Question

我有一個對象表，其中有一個字符的分數和名稱，我想檢索具有最高分數的索引以便能夠制作記分板。

這就是我的陣列的樣子

[
    {
        "score": 51,
        "name": "toto"
    },
    {
        "score": 94,
        "name": "tata"
    },
    {
        "score": 27,
        "name": "titi"
    },
    {
        "score": 100,
        "name": "tutu"
    }
]

在這種情況下，我想獲得得分最高的人的指數，在這種情況下，指數為 3，因為得分最高的是 tutu。

感謝您的幫助

Answer 1

sort函數應該這樣做：

var raw_scores = [
 {
    "score": 51,
    "name": "toto"
 },
 {
    "score": 94,
    "name": "tata"
 },
 {
    "score": 27,
    "name": "titi"
 },
 {
    "score": 100,
    "name": "tutu"
 }
]
var sorted_scores = raw_scores.sort(function(a,b){return b.score - a.score})

w3schools 上的更多信息

Answer 2

您可以使用reduce功能

const array = [
    {
        "score": 51,
        "name": "toto"
    },
    {
        "score": 94,
        "name": "tata"
    },
    {
        "score": 27,
        "name": "titi"
    },
    {
        "score": 100,
        "name": "tutu"
    }
];


const highestScore = array.reduce((last, item) => {
   // return the item if its score is greater than the highest score found.
   if(!last || last.score < item.score) {
      return item;
   }
   return last;
});

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce

Answer 3

使用for循環

var index = 0;
var max = 0;

for (var i = 0; i < scores.length; i++) {
  if (s[i].score > max) {
    max = s[i].score;
    index = i;
  }
}

console.log(index);

Answer 4

var data = [{
    "score": 51,
    "name": "toto"
  },
  {
    "score": 94,
    "name": "tata"
  },
  {
    "score": 27,
    "name": "titi"
  },
  {
    "score": 100,
    "name": "tutu"x
  }
];

var max_score = Math.max.apply(Math, data.map(function(o) {
  return o.score;
}))
console.log(data.filter(i => i.score === max_score))

Answer 5

[...].reduce((acc, item, idx) =>  (item.score > acc.score ? {score: item.score, index: idx} : acc), {score: 0, index:0}).index