Quality terms
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Most referenced — Code Quality
Value Object 5Technical Debt 4Law of Demeter 4Reducing Cyclomatic Complexity Techniques 3Code Readability Metrics 3Object Calisthenics 3Dependency Injection 3Data Clump 3
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Types of Coupling
Coupling grades from Content (worst — direct internal access) to Message (best — pure interface communication), guiding decoupling decisions.
3mo ago
quality advanced
Types of Technical Debt
Technical debt is not uniform — deliberate vs inadvertent, reckless vs prudent quadrants define the nature of debt and the appropriate response to each type.
3mo ago
quality intermediate
Unit of Work
A pattern that tracks all changes made to domain objects during a business transaction and coordinates writing them out as a single atomic database operation.
3mo ago
quality advanced
Value Object
PHP 8.1+
4
A small immutable object defined by its value rather than its identity — two Value Objects with the same data are equal.
3mo ago
quality intermediate
Visitor Pattern
PHP 5.0+
A behavioural pattern that separates an algorithm from the objects it operates on — adding new operations to a class hierarchy without modifying those classes.
3mo ago
quality advanced
YAGNI
PHP 5.0+
You Aren't Gonna Need It — don't implement functionality until it's actually required.
3mo ago
quality beginner
Code Smell
A surface indication in code that usually corresponds to a deeper design problem — not a bug, but a maintainability risk.
3mo ago
quality beginner
Cognitive Complexity
4
A readability-focused complexity metric that penalises nesting more heavily than cyclomatic complexity.
3mo ago
quality intermediate
Dependency Injection
PHP 5.0+ Passing dependencies into a class rather than creating them inside — makes classes testable and loosely coupled.
3mo ago
quality intermediate
DRY Principle
PHP 5.0+
Don't Repeat Yourself — every piece of knowledge should have a single, unambiguous representation in the codebase.
3mo ago
quality beginner
Immutability
PHP 8.1+
1
Objects whose state cannot change after construction — immutable objects are inherently thread-safe, predictable, and easy to reason about.
3mo ago
quality intermediate
Magic Number
PHP 5.0+
A numeric literal with no explanation — its meaning is unclear without context, harming readability and maintainability.
3mo ago
quality beginner
SOLID Principles (Overview)
PHP 5.0+
Five object-oriented design principles — SRP, OCP, LSP, ISP, DIP — that together guide towards maintainable, extensible code.
3mo ago
quality intermediate