YAGNI (You Aren't Gonna Need It) in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to apply the YAGNI principle by avoiding unnecessary features.

LLD

if user_needs_feature:
    implement_feature()
else:
    [1]

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

Awrite_complex_logic()

Bdo_nothing()

Cadd_extra_code()

Doptimize_prematurely()

Attempts:

3 left

💡 Hint

Common Mistakes

Adding code for features not currently needed.

YAGNI means you should do nothing if the feature is not needed yet.

2fill in blank

medium

Complete the code to follow YAGNI by not adding unused parameters.

LLD

def process_data(data[1]):
    # process data
    pass

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

A, config

B, required_param

C, data_format

D, unused_param

Attempts:

3 left

💡 Hint

Common Mistakes

Adding parameters that are never used in the function.

Only include required_param which is necessary; avoid unused parameters.

3fill in blank

hard

Fix the error in the design by removing the unnecessary caching layer as per YAGNI.

LLD

class DataFetcher:
    def fetch(self):
        [1]
        # unnecessary cache layer removed

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Areturn self.database.query()

Breturn self.cache.get_data()

Creturn self.cache.refresh()

Dreturn self.cache.clear()

Attempts:

3 left

💡 Hint

Common Mistakes

Using cache methods when cache is not required.

YAGNI suggests removing unused cache; fetch directly from database.

4fill in blank

hard

Fill both blanks to implement a simple feature without extra complexity, following YAGNI.

LLD

def calculate_total(items):
    total = 0
    for item in items:
        total [1] item.price
    return total [2] discount

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

A+=

B-=

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication or subtraction unnecessarily.

Use += to add prices and + to add discount simply, avoiding unnecessary complexity.

5fill in blank

hard

Fill all three blanks to create a minimal class design that avoids unnecessary features, following YAGNI.

LLD

class User:
    def __init__(self, [1], [2]):
        self.name = [3]
        self.email = [4]

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

Aname

Bemail

Cpassword

Daddress

Attempts:

3 left

💡 Hint

Common Mistakes

Adding unnecessary attributes in the constructor.

Only include name and email in constructor to keep design simple and avoid unused features.