Anti-patterns to avoid in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to avoid the {{BLANK_1}} anti-pattern in system design.

LLD

def handle_request(request):
    # Avoid [1] by not tightly coupling components
    pass

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

Ascalability

Bspaghetti_code

Cmodularity

Dperformance

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'performance' instead of the messy code pattern.

The spaghetti_code anti-pattern means code is tangled and hard to maintain. Avoiding it improves design clarity.

2fill in blank

medium

Complete the code to prevent the {{BLANK_1}} anti-pattern by using proper data storage.

LLD

def save_data(data):
    # Avoid [1] by not storing all data in one place
    pass

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Acaching

Bload_balancing

Csingle_point_of_failure

Dredundancy

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing with 'load_balancing' which is a solution, not an anti-pattern.

The single_point_of_failure anti-pattern means one failure can crash the whole system. Avoid it by distributing data.

3fill in blank

hard

Fix the error in the code that causes the {{BLANK_1}} anti-pattern by separating concerns.

LLD

class UserManager:
    def __init__(self):
        self.db = Database()
    def process(self, data):
        # This causes [1] by mixing logic and data access
        self.db.save(data)
        self.send_email(data)

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

Agod_object

Btight_coupling

Ccircular_dependency

Drace_condition

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'tight_coupling' which is related but not the main issue here.

The god_object anti-pattern happens when one class does too much. Splitting responsibilities fixes it.

4fill in blank

hard

Fill both blanks to avoid the {{BLANK_1}} and {{BLANK_2}} anti-patterns in system design.

LLD

def process_request(req):
    # Avoid [1] by not blocking main thread
    # Avoid [2] by not duplicating code
    pass

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

Ablocking_io

Bcode_duplication

Cmemory_leak

Dtight_coupling

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up 'memory_leak' with blocking issues.

blocking_io causes delays by waiting too long; code_duplication makes maintenance hard. Avoid both for clean design.

5fill in blank

hard

Fill all three blanks to fix the {{BLANK_1}}, {{BLANK_2}}, and {{BLANK_3}} anti-patterns in this code snippet.

LLD

def handle_data(data):
    # Avoid [1] by not sharing mutable state
    # Avoid [2] by not ignoring errors
    # Avoid [3] by not overloading one service
    pass

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

Ashared_mutable_state

Bsilent_failures

Cservice_monolith

Dover_provisioning

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'over_provisioning' with 'service_monolith'.

shared_mutable_state causes bugs from unexpected changes; silent_failures hide problems; service_monolith overloads one service. Fixing these improves reliability.