transcript.js

'use strict';

const dayjs = require('dayjs');

function Exam(code, name, credits, date, score, laude=false) {
  this.code = code;
  this.name = name;
  this.credits = credits;
  this.score = score;
  this.laude = laude;
  this.date = date;

  this.toString = () => (`${this.code} - ${this.name} = ${this.score} (${this.date})`);
}

function ExamList() {
  this.list = [];

  this.add = (e) => {
    this.list.push(e);
  };

  this.find = (code) => {
    for (const c of this.list)
      if(c.code === code)
        return c;
    return undefined;
  };

  this.afterDate = (date) => {
    return this.list.filter(course => course.date.isAfter(date));
  };

  this.listByDate = () => {
    return [...this.list].sort((a,b) => (a.date.isAfter(b.date) ? 1 : -1));
  };

  this.listByScore = () => {
    return [...this.list].sort((a,b) => (b.score - a.score));
  };

  this.average = () => {
    let avg = 0;
    for (const c of this.list)
      avg += c.score;
    avg /= this.list.length;

    return avg;
  };

}

const sdp = new Exam('02XXX', 'System and Device Programming', 10, dayjs('2021-07-01'), 21);

const wa1 = new Exam('01KTF', 'Web Applications I', 6, dayjs('2021-06-01'), 30, true);

const exams = new ExamList();
exams.add(wa1);
exams.add(sdp);

console.log("FIND");
console.log(`${exams.find('01KTF')}`);
console.log(`${exams.find('031KTF')}`);

console.log("AFTER DATE");
console.log(exams.afterDate(dayjs('2021-06-15')).toString());
console.log("BY DATE");
console.log(exams.listByDate().toString());
console.log("BY SCORE");
console.log(exams.listByScore().toString());
console.log("AVERAGE");
console.log(exams.average());