index.js

// index.js
let counter = 0;

const generateId = () => {
  ++counter;
  return counter;
};

class StudentManagement {
  #students = [];

  constructor(students) {
    this.#students = students.map((student) => {
      return { id: generateId(), name: student, performance: null };
    });
  }

  add(...students) {
    students.forEach((student) => {
      this.#students.push({
        id: generateId(),
        name: student,
        performance: null,
      });
    });
  }

  getStudent(studentIDOrName) {
    if (studentIDOrName) {
      return this.#students.filter(
        (student) =>
          studentIDOrName === student.id || studentIDOrName === student.name
      );
    }
    return this.#students;
  }

  score(id, performance) {
    if (performance >= 0 && performance <= 100) {
      this.#students.find((student) => {
        if (student.id === id) {
          student.performance = performance;
        }
      });
    } else throw new Error("Score should be between 0 and 100");
  }
}

module.exports = StudentManagement;