Quick study sessions to strengthen memory and retain key concepts.
Why does OrderOps care about instance methods?
Because the toolkit now carries orders, lines, customers, and inventory concepts that deserve clearer state and behavior than…
View Card →What is the best default for instance methods?
Choose the simplest shape that keeps the rule explicit, testable, and easy for the next engineer to read.…
View Card →How should you explain instance methods in an interview?
Keep behavior on the object when it mainly exists to answer a question about that object's own state.…
View Card →What is the main pitfall around instance methods?
If every operation stays outside the object forever, the model can become a passive bag of fields. Naming…
View Card →What is the core rule behind instance methods?
Keep behavior on the object when it mainly exists to answer a question about that object's own state.…
View Card →What does good composition code look like?
It is explicit about the rule, honest about the data shape, easy to test, and easy to explain…
View Card →What is the next improvement after the first working version of composition?
Clarify one boundary, add one focused test, and remove one avoidable ambiguity. Small improvements that directly reduce risk…
View Card →What anti-pattern should you watch for with composition?
Using the feature to compress code while making the rule harder to test, debug, or explain. Compression is…
View Card →What does a good verbal answer about composition sound like?
Clear, concrete, tradeoff-aware, and tied to one real workflow or bug pattern. Interview answers improve when they sound…
View Card →What senior-level judgment belongs with composition?
State when you would choose this approach, when you would not, and which signal would trigger a different…
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