Hide the decision, not the syntax
Use information hiding to choose which implementation decisions deserve a module boundary.
The move: ask what future decision the caller should not have to know. The mechanism Information hiding reduces ripple effects. The module boundary absorbs changes to an internal decision while callers keep using a stable interface. What to hide Hide vendor details, storage formats, security policies, date rules, serialization shapes, feature-flag mechanics, and any algorithm that has changed before or is likely to change again. What not to hide Do not hide a clear line of code behind a vague helper just to make the file look abstract. If the helper name does not reveal a stable concept, it may…
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