Design Principles Flashcards
What does SOLID stand for?
- Single Responsibility Principle
- Open/Closed Principle
- Liskov Substitution Principle
- Interface Segregation Principle
- Dependency Inversion Principle
Summarize ‘S’
- Every class does one thing
- Responsibility is encapsulated by the class
Summarize ‘O’
- Open for extension
- Closed for modification
- Extend the class rather than changing it
Summarize ‘L’
- Subtypes should be able to act as substitutes of supertypes without any additional modification
- (ie If S is a subtype of T, then S can be used in place of T without throwing any syntax errors)
Summarize ‘I’
-Make many specific interfaces for clients so that they don’t need to deal with information irrelevant to them
Summarize ‘D’
- Add a layer of abstraction between high and low level classes
- Allows us to change both high and low level classes without having to change the other
Difference between Architecture and Design
- Design = low-level code decisions/classes, methods
- Architecture = choice of technologies
Which is more important between architecture and design, and why?
- Architecture
- Architecture choices guide discussion of solutions
- Architecture allows for review
What does NFR stand for, and what are common examples?
- Non-functional requirements
- System qualities that can’t be expressed as features
- Performance, usability, security, availability, robustness, etc.
What issues do successful architectures address?
- Pick the best structure for functional/non-functional requirements
- Pick the best structure to ensure we can build the system given
What does the overall cost of a system depend on?
- Cost of production/debugging
- Cost of maintenance
What are the two types of complexity? What are the differences?
- Inter-module and intra-module complexity
- Intra = complexity within one module
- Inter = complexity between modules
Name types of cohesion from worst to best (Hint: CLITPACIFIER THANKS @ARKON)
- Coincidental
- Logical
- Temporal
- Procedural
- Communicational
- Sequential
- Functional
Name the summarized points of design principles
- Decomposition
- Information hiding
- Minimize coupling
- Maximize Cohesion
- Extensibility
What is coincidental cohesion?
Literally no reason for the two things to be in the same routine.
