Quick study sessions to strengthen memory and retain key concepts.
When does composition need a refactor?
When the rule is no longer easy to explain, test, or change without surprising nearby code. Refactoring is…
View Card →What production lens matters for composition?
Assume the simple demo is not enough. Real data volume, partner behavior, and partial failures will pressure the…
View Card →What review lens should you apply to composition code?
Ask whether the next engineer can see the rule, the data shape, and the likely failure mode quickly.…
View Card →What testing lens fits composition?
Test the boundary cases and invariants that would silently break if the rule were misunderstood. Good tests preserve…
View Card →What debugging lens helps most with composition?
Trace one real example, inspect the state changes, and compare them to the rule you intended to implement.…
View Card →Why does OrderOps care about composition?
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 composition?
Choose the simplest shape that keeps the rule explicit, testable, and easy for the next engineer to read.…
View Card →How should you explain composition in an interview?
Connect smaller objects through references when the domain is about collaboration rather than type substitution. Interviewers look for…
View Card →What is the main pitfall around composition?
Inventing inheritance too early often hides the real relationships in the problem. Naming the pitfall early helps you…
View Card →What is the core rule behind composition?
Connect smaller objects through references when the domain is about collaboration rather than type substitution. This matters because…
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