Build a Heritage Library Catalog - Step 18

JavaScript
1

Tell us what’s happening:

I have tried different ways of accomplishing the same thing, but it still tells me I need to initialize grouped[“Unknown”] as an empty array if it doesn’t exist yet. I’ve tried assigning “Unknown” to a variable and using that variable inside the brackets. I’ve tried using dot notation with the “Unknown” variable. I’ve tried using let to initialize grouped[“Unknown”] to an empty array. Nothing is working. I don’t know what the issue is.

Your code so far

const rawCatalogCards = [
  "From a Buick 8 | King, Stephen | 2002 | Shelf K7",
  "The Shining | King, Stephen | 1977 | Shelf K1",
  "The Stand | King, Stephen | 1978 | Shelf K2",
  "It | King, Stephen | 1986 | Shelf K3",
  "Misery | King, Stephen | 1987 | Shelf K4",
  "Do Androids Dream of Electric Sheep? | Dick, Philip K. | 1968 | Shelf D5",
  "I, Robot | Asimov, Isaac | 1950 | Shelf A8",
  "Foundation | Asimov, Isaac | 1951 | Shelf A9",
  "Dune | Herbert, Frank | 1965 | Shelf H3",
  "Neuromancer | Gibson, William | 1984 | Shelf G8",
  "Snow Crash | Stephenson, Neal | 1992 | Shelf S6",
  "The Martian | Weir, Andy | 2011 | Shelf W5",
  "Ender's Game | Card, Orson Scott | 1985 | Shelf C2",
  "The Hitchhiker's Guide to the Galaxy | Adams, Douglas | 1979 | Shelf A1",
  "Ready Player One | Cline, Ernest | 2011 | Shelf C7",
  "The Dark Tower: The Gunslinger | King, Stephen | 1982 | Shelf K5",
  // edge cases: missing data
  "Unknown Title |  | 1975 | Shelf X1",
  "Mysterious Manuscript | Unknown Author |  | Shelf Z9",
  "Ancient Scroll | Anonymous | 850 | ",
];

function parseCard(rawString) {
  const parts = rawString.split("|");
  const trimmedParts = [];
  for (let i = 0; i < parts.length; i++) {
    trimmedParts.push(parts[i].trim());
  }
  const title = trimmedParts[0];
  const author = trimmedParts[1];
  const year = trimmedParts[2];
  const location = trimmedParts[3];
  return {
    title: title || "Unknown",
    author: author || "Unknown",
    year: year ? parseInt(year) : "Unknown",
    location: location || "Unknown"
  };
}

function parseCatalog(rawCards) {
  const catalog = [];
  for (let i = 0; i < rawCards.length; i++) {
    catalog.push(parseCard(rawCards[i]));
  }
  return catalog;
}

const catalog = parseCatalog(rawCatalogCards);

function findByAuthor(catalog, author) {
  const searchTerm = author.toLowerCase();
  const results = [];
  for (let i = 0; i < catalog.length; i++) {
    if (catalog[i].author.toLowerCase().includes(searchTerm)) {
      results.push(catalog[i]);
    }
  }
  return results;
}

function groupByDecade(catalog) {
  const grouped = {};
  for (let i = 0; i < catalog.length; i++) {
    const book = catalog[i];

// User Editable Region

    if (book.year === "Unknown") {
      if (grouped["Unknown"] === undefined) {
        grouped["Unknown"] = [];
      }
      grouped["Unknown"].push(book);
      continue;
    }

// User Editable Region

  }
}

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36

Challenge Information:

Build a Heritage Library Catalog - Step 18

2

I believe I fixed it by going this route:

removed by moderator

3

Hi @suphxx,

Congratulations on solving the challenge! You should be proud of your achievement…we are! But we are removing your working solution, so it is not available to others who have not yet done the work to get there. Again, congrats!

Happy coding!