[Solved] A developer wrote this code to release expired holds: for hold in holds: if hold.expiration_time What is the main issue with this code? | LLD

LLD - Design — Library Management System

A developer wrote this code to release expired holds:

for hold in holds:
    if hold.expiration_time < current_time:
        holds.remove(hold)

What is the main issue with this code?

AHolds should not be removed, only marked expired

BModifying a list while iterating causes skipped elements or errors

CExpiration time comparison is incorrect

DLoop should use while instead of for

Step-by-Step Solution

Solution:

Step 1: Understand iteration and modification
Removing items from a list while iterating over it causes skipping or runtime errors.
Step 2: Identify correct approach
Use a separate list to collect expired holds or iterate over a copy to safely remove.
Final Answer:
Modifying a list while iterating causes skipped elements or errors -> Option B
Quick Check:
Remove during iteration = skipped elements [OK]

Quick Trick: Never remove items from list while looping over it [OK]

Common Mistakes:

MISTAKES

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A developer wrote this code to release expired holds: