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![Train Wreck
client.getMortgage().paymentCollection().getNextPayment().applyPayment(300.0)
(update-in client [:mortgage :payments] conj (payment 300.0))
wiki.c2.com/?TrainWreck](https://image.slidesharecdn.com/modular-design-principles-in-oop-and-fp-170224201511/85/Modular-Design-Laws-and-Principles-in-OOP-and-FP-11-320.jpg)
Modular Design - Laws and Principles - in OOP and FP
- 1. Modular Design Laws andPrinciples in OOP and FP
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- 4. ● Coincidental Cohesion:unrelated elements ● Temporal Cohesion: operations performed at the same time, e.g. initialization ● Sequential Cohesion: operations form a pipeline - one's output is another's input ● Informational Cohesion: operations are performed on the same data structure ● Functional Cohesion: all elements realize a single, well-defined task, e.g. a function Cohesion levels
- 5. ● Content Coupling:a module uses/alters data in another module ● Global-data Coupling: two modules communicate via global data ● Data-structure Coupling: communicate via data structure passed as a parameter (more information than needed) ● Data Coupling: communicate via parameter passing (minimal information) ● No Coupling: independent modules Coupling levels
- 6. A modular unitof code... ● serves a clear purpose ● easy to use ● easy to extend ● easy to replace ● survives outside changes Single Responsibility Liskov Substitution Interface Segregation Open-Closed Principle Dependency Inversion
- 7. Elements inside apackage... ● are used together ● change together Common Reuse Principle Common Closure Principle
- 8. Packages should... ● beas stable as they are abstract ● depend on more stable packages ● not have cycles Stable Abstractions Principle Stable Dependencies Principle Acyclic Dependencies Principle
- 9. The Law ofDemeter "the principle of least knowledge" A B E G F D C B E
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- 11. Train Wreck client.getMortgage().paymentCollection().getNextPayment().applyPayment(300.0) (update-in client[:mortgage :payments] conj (payment 300.0)) wiki.c2.com/?TrainWreck
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