DRY // Don't Repeat Yourself
Duplication is the enemy of system maintenance. Every structural piece of knowledge, calculation, or business logic must have a single, authoritative, and completely unambiguous representation across your application architecture.
- The Core Idea: Stop repeating structural logic, configurations, or copying block snippets.
- The Solution: Extract repeating blocks into unified helper methods, shared utility modules, or reusable parent classes.
- Benefit: Minimizes debugging cycles; edits to application rules happen once, instantly flowing throughout the system.
KISS // Keep It Simple, Stupid
Systems reach peak operational safety when they are kept simple rather than engineered into complex riddles. True engineering elegance lies in solving difficult business problems with minimal, highly readable code paths.
- The Core Idea: Avoid writing abstract code structures to address simple problems.
- The Solution: Write clear, linear, self-documenting syntax that addresses the problem safely and directly.
- Benefit: Accelerates developer onboarding speeds and ensures software testing pipelines remain fast and reliable.
YAGNI // You Aren't Gonna Need It
A direct, tactical counterweight to over-engineering. YAGNI states that a developer should never implement functionality or features based on the mere assumption that it might be useful or necessary somewhere down the line.
- The Core Idea: Do not build complex frameworks or hooks for imaginary future scaling requirements.
- The Solution: Focus exclusively on the requirements defined for the current development sprint.
- Benefit: Saves hundreds of wasted engineering hours, reduces code bloat, and stops bugs from creeping into dead code.
SoC // Separation of Concerns
A fundamental architectural philosophy stating that a software system should be split into distinct sections. Each section must address a completely different, isolated concern or layer of responsibility within the application.
- The Core Idea: Do not mix unrelated domains—like database queries, business rules, and user interfaces—inside the same module.
- The Solution: Partition code bases into distinct logical layers, components, or services (e.g., Model-View-Controller patterns).
- Benefit: Modules become isolated building blocks, allowing developers to change the UI look without risking damage to critical data processing rules.
SOLID // Object-Oriented Design Framework
SOLID is an acronym for five principles of object-oriented design. Together they guide you toward software that's modular, testable, and resilient to change — code that can grow without rotting.
A class or module should have exactly one reason to change. It should encapsulate a single, isolated slice of business functionality to prevent edits in one feature from breaking unrelated code.
Software components should be open for extension but safely closed for modification. You must be able to add new application behaviors via inheritance or polymorphism without rewriting working code.
Subtypes must be completely substitutable for their base types. Derived classes must extend the base class's behaviors correctly without altering its core contract or crashing the system runtime.
Clients should never be forced to depend on interface contracts they do not use. Split fat, bloated interfaces into smaller, highly specific, targeted ones so changes only hit relevant consumers.
High-level logic modules must not depend directly on concrete low-level modules; both must rely entirely on shared abstractions. This decouples code modules and simplifies unit testing.