Loops in Solidity:
A) are a great way to circumvent gas requirements, because a loop will only consume gas once.
B) are dangerous when used with data structures that grow, such as arrays or mapping, because it is hard to estimate the gas requirements.
C) should be avoided where possible, because of unknown side-effects on the gas requirements.

Question

Quizplus · Accepted Answer

Loops in Solidity can be dangerous with growing data structures because each iteration consumes gas, and if the data structure grows, the gas cost can become unpredictable and potentially exceed the block gas limit.