06. Book Library Modification (Archive Objects & Classes)

function solve(input) {
  class Book {
    constructor(title, author, publisher, releaseDate, isbn, price) {
      this.title = title;
      this.author = author;
      this.publisher = publisher;
      this.date = releaseDate;
      this.isbn = isbn;
      this.price = price;
    }
  }

  let data = input.slice(0).filter(x => x !== "");
  const count = Number(data.shift());
  const date = data.pop();
  let [day, month, year] = date.split(".").map(Number);
  let library = {};
  for (const line of data) {
    let book = new Book(...line.split(" "));
    library[book.title] = book.date.split(".").map(Number);
  }

  let result = Object.entries(library);
  result
    .filter(entry => {
      if (entry[1][2] === year) {
        if (entry[1][1] === month) {
          if (entry[1][0] > day) {
            return entry;
          }
        } else if (entry[1][1] > month) {
          return entry;
        }
      } else if (entry[1][2] > year) {
        return entry;
      }
    })
    .sort((a, b) => {
      if (b[1][2] === a[1][2]) {
        if (b[1][1] === a[1][1]) {
          if (a[1][0] === b[1][0]) {
            return a[0].localeCompare(b[0]);
          }
          return a[1][0] - b[1][0];
        }
        return a[1][1] - b[1][1];
      }
      return a[1][2] - b[1][2];
    })
    .forEach(entry => {
      let output = "";
      output += entry[0];
      output += " -> ";
      output += entry[1]
        .map(el => {
          if (el < 10) {
            return `0${el}`;
          } else {
            return `${el}`;
          }
        })
        .join(".");
      console.log(output);
    });
}