javascript - 循环遍历对象数组并获取平均值

Question

我希望循环遍历原型(prototype)函数中的对象数组。循环后，我想获取 gpa 数组的平均值，然后控制台记录名称、地址、gpa 和平均 gpa。除了平均水平以外，我都能做到。我希望这一切都在测试功能中一起运行。感谢您的所有帮助。

var students = [{
    name: "Walker",
    address: {
        street: "123 South Drive",
        city: 'Sarasota',
        state: 'FL'
    },
    gpa: [3.0, 3.4, 3.8]
}, {
    name: "Christian",
    address: {
        street: "5601 Pebble Beach Ln",
        city: 'Sacromento',
        state: 'CA'
    },
    gpa: [2.5, 3.6, 3.8]
}];

var stud = Students(students);



stud.testing();

构造函数:

var Students = function (students) {
    return new Students.prototype.init(students);
}

Students.prototype = {
    init: function (students) {
        this.students = students;
    },
    testing: function () {


        for (i = 0; i < this.students.length; i++) {
            i = i % this.students.length;


            for (j = 0; j < this.students.length; j++) {



                this.gpa1 = this.students[j].gpa;
                this.len = this.students[j].gpa.length;

                //console.log(this.gpa1);

                this.average = this.gpa1[0] + this.gpa1[1] + this.gpa1[2];
                this.res = this.average / this.len;
                console.log(this.res);
            }




            console.log("Name: " + this.students[i].name);
            console.log("Address: " + this.students[i].address.street + ' ' + this.students[i].address.city + ' ' + this.students[i].address.state);
            console.log("GPA: " + this.students[i].gpa);
            console.log("Average: " + this.gpa1);


        }
    },
    addData: function (student3) {
        this.students.push(student3);
    }

Answer 1

这应该很简单，循环遍历学生，然后循环遍历他们的 GPA 分数，将它们相加并除以总分:

testing: function () {
    var total = 0;
    var numPoints = 0;
    for (var i = 0; i < this.students.length; i++) {
        var thisStudentsTotal = 0;
        for (var j = 0; j < this.students[i].gpa.length; j++) {
            total += this.students[i].gpa[j];
            thisStudentsTotal += this.students[i].gpa[j];
            numPoints++;
        }
        // This is the average for just this student
        this.students[i].myAvg = thisStudentsTotal / this.students[i].gpa.length;
    }
    // This is the average for every student
    var theAverage = total / numPoints;
}