Answer
Extension methods add functionality to existing types without modifying them.
You should avoid them when they reduce readability, create ambiguity, or introduce responsibilities that do not logically belong to the type.
Quick Answer
Extension methods add functionality to existing types without modifying them. Avoid them when they reduce readability, create ambiguity between methods, or add responsibilities that do not logically belong to the type. Good extension methods feel native; bad ones feel out of place.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ