InSearchEngine.js

class InMemorySearch {
  constructor() {
    this.documents = new Map();
  }

  addDocuments(...args) {
    const key = args[0];
    const val = args.filter((arg) => arg !== key);
    if (!this.documents.has(key)) {
      this.documents.set(key, val);
    } else {
      const present = this.documents.get(key);
      const combinedVal = [...present, ...val];
      this.documents.set(key, combinedVal);
    }
  }
  search(nameSpace, callback, obj) {
    const result = this.documents.get(nameSpace);
    const filteredResults = result.filter(callback);
    const sortedKey = obj.key;
    const filteredResultsSorted = filteredResults.sort((a, b) => {
      if (obj.asc === false) {
        return b[sortedKey] - a[sortedKey];
      }
      return a[sortedKey] - b[sortedKey];
    });
    return filteredResultsSorted;
  }
}

const searchEngine = new InMemorySearch();

searchEngine.addDocuments(
  "Movies",
  { name: "Avenger", rating: 8.5, year: 2017 },
  { name: "Black Adam", rating: 8.7, year: 2022 },
  { name: "Jhon Wick 4", rating: 8.2, year: 2023 },
  { name: "Black Panther", rating: 9.0, year: 2022 }
);

console.log(
  searchEngine.search("Movies", (e) => e.rating > 8.5, {
    key: "rating",
    asc: false,
  })
);

// Output
/*
[
  {
    "name": "Black Panther",
    "rating": 9,
    "year": 2022
  },
  {
    "name": "Black Adam",
    "rating": 8.7,
    "year": 2022
  }
]
*/