Search functionality design in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main component responsible for handling search queries.

LLD

class [1] {
    public void handleSearch(String query) {
        // Implementation
    }
}

Drag options to blanks, or click blank then click option'

ASearchHandler

BQueryProcessor

CSearchEngine

DResultFetcher

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a class name that implies fetching results instead of handling queries.

Using a generic name that does not clearly indicate its role.

The class SearchHandler is the main component that handles search queries in this design.

2fill in blank

medium

Complete the code to add a method that indexes documents for search.

LLD

public class Indexer {
    public void [1](Document doc) {
        // Indexing logic
    }
}

Drag options to blanks, or click blank then click option'

AindexDocument

Bsearch

CfetchResults

DprocessQuery

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names related to searching instead of indexing.

Choosing vague method names that do not describe the action.

The method indexDocument is responsible for adding documents to the search index.

3fill in blank

hard

Fix the error in the code that processes search queries asynchronously.

LLD

public class AsyncSearchProcessor {
    public Future<List<Result>> processQuery(String query) {
        return executorService.[1](() -> {
            // Search logic
            return search(query);
        });
    }
}

Drag options to blanks, or click blank then click option'

Ainvoke

Bexecute

Crun

Dsubmit

Attempts:

3 left

💡 Hint

Common Mistakes

Using execute which returns void, causing a type mismatch.

Using run or invoke which are not methods of executorService.

The submit method returns a Future object, which is needed for asynchronous processing with a result.

4fill in blank

hard

Fill both blanks to complete the code for filtering search results by relevance and date.

LLD

List<Result> filteredResults = results.stream()
    .filter(r -> r.getRelevance() [1] 0.8)
    .filter(r -> r.getDate() [2] LocalDate.now().minusDays(30))
    .collect(Collectors.toList());

Drag options to blanks, or click blank then click option'

A>=

B<=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators that exclude desired results.

Mixing up greater than and less than for date filtering.

The code filters results with relevance greater than or equal to 0.8 and dates within the last 30 days (less than or equal to 30 days ago).

5fill in blank

hard

Fill all three blanks to complete the code that builds a search query with filters and sorting.

LLD

SearchQuery query = new SearchQuery.Builder()
    .setKeyword([1])
    .addFilter([2], [3])
    .setSortOrder(SortOrder.RELEVANCE)
    .build();

Drag options to blanks, or click blank then click option'

A"machine learning"

B"date"

C"last_30_days"

D"popularity"

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated filter fields or values.

Setting keyword to a filter value instead of a search phrase.

The keyword is set to "machine learning", the filter is on the "date" field, and the filter value is "last_30_days" to restrict results.