在对象数组中插入新元素并对数组进行排序

debugcn 发表于 Dev

应

我有一个包含对象名称和标记的对象数组。像下面

如何计算每个学生的“平均”分数并比较“平均”分数以获得最高的学生。我不想使用ES6

var Students = [{
    name: "Bob",
    marks: [78, 80, 89, 90, 68]
  },
  {
    name: "Alin",
    marks: [87, 60, 59, 70, 68]
  },
  {
    name: "bikash",
    marks: [82, 60, 79, 60, 80]
  }
];


var average;
var newArray = [];
for (let i = 0; i < Students.length; i++) {
  var marks = Students[i]["marks"];
  var total = 0;
  console.log(marks);
  for (var j = 0; j < marks.length; j++) {
    total += marks[j];
  }
  average = total / marks.length;
  newArray.push(average)
  var msg = Students[i]["name"] + " has average mark: " + average;
  console.log(msg)

}

console.log(newArray)

我想在对象中插入平均值以及名称，例如[{name：“ Bob”，平均值：89.4}，{name：“ Alin”，平均值：87.2}，{name：“ Bikash”，平均值：89.4 }然后对对象进行排序。

最后，我想要console.log，因为Bob是成绩最好的学生，或者Alin和Bob是成绩最好的学生（如果他们的平均数相同）

巴尔玛

不要将平均值推入新数组，将其添加为Students[i]with的属性Students[i].average = average;。

然后，您可以使用该属性对数组进行排序，并从排序后的数组中将其打印给学生。

var Students = [{
    name: "Bob",
    marks: [78, 80, 89, 90, 68]
  },
  {
    name: "Alin",
    marks: [87, 60, 59, 70, 68]
  },
  {
    name: "bikash",
    marks: [82, 60, 79, 60, 80]
  }
];


var average;
for (let i = 0; i < Students.length; i++) {
  var marks = Students[i]["marks"];
  var total = 0;
  for (var j = 0; j < marks.length; j++) {
    total += marks[j];
  }
  average = total / marks.length;
  Students[i].average = average;
  var msg = Students[i]["name"] + " has average mark: " + average;
  console.log(msg)

}
Students.sort((s1, s2) => s2.average - s1.average);
var topAvg = Students[0].average;
var topStudents = Students.filter(s => s.average == topAvg).map(s => s.name).join(", ");
console.log(`Top Students are ${topStudents} with mark ${topAvg}`);

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