Given a list of user objects, how can you use functional patterns with OOP to create a new list of usernames in Ruby without changing the original user objects?

hard📝 Application Q9 of 15

Ruby - Functional Patterns in Ruby

AUse map to extract usernames into a new array, leaving original objects unchanged.

BModify each user object to add a username attribute.

CDelete all user objects and create new ones with usernames.

DUse a loop to print usernames without storing them.

Step-by-Step Solution

Solution:

Step 1: Identify functional pattern for transformation
map creates a new array by applying a block to each element without modifying originals.
Step 2: Apply map to user objects
Extract usernames with map, producing a new list and preserving original objects.
Final Answer:
Use map to extract usernames into a new array, leaving original objects unchanged. -> Option A
Quick Check:
map creates new list without changing originals [OK]

Quick Trick: Use map to transform without mutation [OK]

Common Mistakes:

Modifying original objects instead of creating new data
Deleting objects unnecessarily
Only printing without storing results

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More Ruby Quizzes

Given a list of user objects, how can you use functional patterns with OOP to create a new list of usernames in Ruby without changing the original user objects?

Step 1: Identify functional pattern for transformation

Step 2: Apply map to user objects

Final Answer:

Quick Check:

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