Feature toggles in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a feature toggle flag in a microservice configuration.

Microservices

feature_flags = {"new_ui": [1]

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

A1

B"enabled"

CTrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using string values like "enabled" instead of boolean.

Using lowercase false instead of False.

The feature toggle flag should be a boolean value. Using True enables the feature.

2fill in blank

medium

Complete the code to check if a feature toggle is enabled before executing new code.

Microservices

if feature_flags.get("new_ui", [1]):
    launch_new_ui()

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

AFalse

B0

CTrue

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using None or 0 which are truthy or ambiguous.

Using True which enables feature by default.

The default value should be False to avoid enabling the feature unintentionally.

3fill in blank

hard

Fix the error in the feature toggle evaluation logic.

Microservices

if feature_flags["new_ui"] == [1]:
    enable_feature()

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

A1

BTrue

C"true"

Denabled

Attempts:

3 left

💡 Hint

Common Mistakes

Comparing to string "true" or "enabled" instead of boolean True.

Using integer 1 which can cause confusion.

The feature toggle should be compared to the boolean True, not strings or integers.

4fill in blank

hard

Fill both blanks to implement a feature toggle check with fallback and logging.

Microservices

status = feature_flags.get("beta_feature", [1])
if status == [2]:
    log("Feature enabled")
    run_beta_feature()

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

AFalse

BTrue

CNone

Denabled

Attempts:

3 left

💡 Hint

Common Mistakes

Using None or string 'enabled' as fallback or comparison.

Comparing fallback value instead of actual status.

Use False as fallback and compare with True to run the feature.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that filters enabled features.

Microservices

enabled_features = {feature: config for feature, config in feature_flags.items() if config == [1] and feature != [2] and feature != [3]

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

ATrue

B"deprecated_feature"

C"old_ui"

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using False instead of True for filtering.

Not excluding deprecated features correctly.

Filter features where config is True and exclude deprecated features by name.