class School {

constructor() {

this.students = [];

}

addStudent(student) {

this.students.push(student);

}

findByGrade(gradeLevel) {

return this.students.filter((s) => s.gradeLevel === gradeLevel);

}

findByAge(age) {

return this.students.filter((s) => s.age === age);

}

findByName(name) {

return this.students.filter((s) => s.name === name);

}

}

class Student {

constructor(name, age, gradeLevel) {

this.name = name;

this.age = age;

this.gradeLevel = gradeLevel;

this.courses = [];

}

calculateAverageGrade() {

const totalGrades = this.courses.reduce((prev, curr) => prev + curr.grade, 0);

return (totalGrades / this.courses.length).toFixed(2);

}

assignGrade(name, grade) {

this.courses.push(new Course(name, grade))

}

}

class Course {

constructor(name, grade) {

this.name = name;

this.grade = grade;

}

}

function test() {

const testSchool = new School();

const testStudent = new Student('Miku', 16, 10);

testStudent.assignGrade('music', 90);

testStudent.assignGrade('math', 80);

assert(testStudent.calculateAverageGrade() == 85.00);

const testStudent2 = new Student('Rin', 14, 8);

const testStudent3 = new Student('Len', 14, 8);

testSchool.addStudent(testStudent);

testSchool.addStudent(testStudent2);

testSchool.addStudent(testStudent3);

assert(testSchool.findByAge(14)[0].name === 'Rin');

assert(testSchool.findByGrade(10)[0].name === 'Miku');

assert(testSchool.findByGrade(8).length === 2);

assert(testSchool.findByName('Rin')[0].name === 'Rin');

console.log('TEST PASSED');

}

test();