javascript - 我想知道学生数组中是否有某个名字，如果有则打印出true，如果没有则打印出false

Question

function createStudent(fn, ln) {  //function
  var person = {       
    firstName: fn,
    lastName: ln
  };
  return person;
}

    var tim = createStudent("Tim", "Plano");
    var matt = createStudent("Matt", "Asant");
    var elie = createStudent("Elie", "Garcia");

    var students = [tim, matt, elie];
//Function      
    findStudentByFirstName(name); {
      for (var i = 0; i < students.length; i++) {
        if (name[i]=== students.firstName) {
          return true;
        } else {
          return false;
        }


      }
    }



I do not know what I'm doing wrong, can anyone please help me. Thank you in Advance.

Answer 1

看来您遇到了一些问题。声明您的findStudentByFirstName函数应该使用相同的 function您在编写 createStudent 时使用的关键字。其次，您想移动您的 return false在 for 循环之外，以便您最终测试每个学生的姓名，然后再声称找不到他/她。最后，通过您的循环，您可能想访问 students[i] (数组元素)而不是 name[i] (这将是目标名称字符串的 (i+1) 第一个字符)。

function findStudentByFirstName(name) {
    for (var i = 0; i < students.length; i++) {
        if (name === students[i].firstName) {
          return true
        }
    }
    return false
}

function createStudent(fn, ln) {
    var person = {       
        firstName: fn,
        lastName: ln
    };
    return person;
}

var tim = createStudent("Tim", "Plano");
var matt = createStudent("Matt", "Asant");
var elie = createStudent("Elie", "Garcia");

var students = [tim, matt, elie];

console.log(findStudentByFirstName('Tim')) //=> true
console.log(findStudentByFirstName('Joe')) //=> false