Scalable Component Design and Code Review Standards
By the end of this lesson, you'll be able to:
- Explain what "scalable" means for component design, distinct from performance
- Apply this module's principles as a practical code review checklist
- Recognize why these standards matter as a codebase and team grow
Prerequisites: "Configuration-Driven Development with Custom Metadata"
What "Scalable" Means Here
Not performance at runtime (Module 13's concern) — maintainability as a codebase and team grow. Can a new developer, unfamiliar with this specific component, understand and safely modify it without breaking something else or duplicating logic that already exists elsewhere?
A Practical Code Review Checklist
This module's own lessons form a genuine, usable checklist:
- Separation of concerns (Lesson 1) — is business logic cleanly separated from UI/rendering code, both client-side and in Apex?
- Controller/Service/Selector layering (Lesson 2) — for Apex, is the Controller genuinely thin, with real logic living in Service/Selector classes?
- Consistent error handling (Lesson 3) — does this component use the shared error-handling pattern, rather than inventing its own?
- Appropriate use of configuration (Lesson 4) — are genuinely admin-tunable values pulled from Custom Metadata rather than hardcoded as "magic numbers," without over-configuring logic that should stay in code?
Why This Matters in Real Projects
These standards are exactly what keeps a large, growing set of components — like the ones built across this entire course — maintainable by an entire team over years, not just understandable by the one developer who originally wrote them. A component that passes this checklist is genuinely easier to hand off, extend, and trust.
Exercise
A code review finds an Apex method marked @AuraEnabled directly containing 40 lines of business logic and a raw SOQL query. Using this module's checklist, identify, as a comment, which two principles are being violated.
Show hint
Think about what a thin Controller and isolated query logic would look like instead.
Exercise
Challenge: explain, as a comment, why "can a new developer safely modify this component" is a more useful definition of scalable than "does this component run fast."
Show hint
Think about what actually limits a growing codebase over time.
Scalable Component Design and Code Review Standards Quiz
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Summary
A hands-on capstone turning this module's four principles into a practical code review checklist — the standards that keep a growing codebase maintainable by a whole team, not just understandable by its original author.