創建一個名爲addGrade

Question

我需要創建一個名爲addGrade具有以下功能PARAMS功能：指數， 數組中得到了學生的指標，並增加了他一個新的檔次品位。

我與所有的學生對象數組，現在我需要通過其ID添加年級的所有學生。

var studentArray = []; 
 
var grade = []; 
 

 

 
function createStudent(id, age, firstName, lastName){ 
 
    this.id = id; 
 
    this.age = age; 
 
    this.firstName = firstName; 
 
    this.lastName = lastName; 
 
    
 
} 
 

 
var student1 = new createStudent(111, 36, "A", "A"); 
 
var student2 = new createStudent(222, 46, "B", "B"); 
 
var student3 = new createStudent(333, 56, "C", "C"); 
 
var student4 = new createStudent(444, 66, "D", "D"); 
 

 
studentArray.push(student1, student2, student3, student4); 
 

 

 

 
function addGrade(id, grade){ 
 
    
 
    
 
} 
 

 
console.log(studentArray);

我怎樣才能做到這一點？我真的很失落！

謝謝！

Answer 1

由於等級屬於學生倒不如添加grade作爲屬性到Student對象，而不是一個單獨的grade陣列。然後在我的評論指出，所有你需要做的是遍歷數組，檢查是否student.id給定的參數匹配id如果是分配給student.grade = grade學生年級grade。

var studentArray = []; 
 

 
function createStudent(id, age, firstName, lastName){ 
 
    this.id = id; 
 
    this.age = age; 
 
    this.firstName = firstName; 
 
    this.lastName = lastName; 
 
    this.grade = null; 
 
} 
 

 
var student1 = new createStudent(111, 36, "A", "A"); 
 
var student2 = new createStudent(222, 46, "B", "B"); 
 
var student3 = new createStudent(333, 56, "C", "C"); 
 
var student4 = new createStudent(444, 66, "D", "D"); 
 

 
studentArray.push(student1, student2, student3, student4); 
 

 
addGrade(111, "A"); // Give student 111 a A 
 
addGrade(222, "C"); // Give student 222 a C 
 
addGrade(444, "B"); // Give student 444 a B 
 
        // Student 333 will have the default null value 
 

 
function addGrade(id, grade){ 
 
    studentArray.forEach(function(student){ // For each student in the studentArray 
 
     if(student.id == id)     // If that student id matches the given id 
 
     student.grade = grade;    // Assign the given grade to that student 
 
    }); 
 
} 
 

 
console.log(studentArray);