The advantages of CUPID (that have nothing to do with bow and arrows)ĬUPID has the same basic philosophy as SOLID: when coding, think about the people who will come after you. The code should be compatible with its domain, using the problem domain’s language to avoid the need for future developers to ‘translations’ or cognitive leaps in order to understand it. Domain-based – “the solution domain models the problem domain in language and structure” (To be clear, that “someone else” is an experienced developer who understands the language in use, including its libraries and so on). Quirky code is out! With CUPID, the code should be understandable by someone else, not just you, the original coder. No unpleasant surprises is the idea here. If it looks like X then X is what is should be and do. The goal here is code that is robust, reliable, and resilient. The Unix philosophy encourages coding components that work well together, each doing one thing and doing it well. Unix is a longstanding operating system (or family of systems) that led to today’s Linux. It is also intention-revealing, requires minimal dependencies and small surface area. What does it stand for? Composable – “plays well with others”Ĭomposable code has classes and functions that are easily combined, assembled in different combinations, to address specific requirements. Of course, just being critical isn’t very constructive or helpful, hence the suggestion of CUPID as a replacement. Is TypeScript a good investment for your next digital product? What is CUPID and why is it… joyful?ĬUPID is the creation of Dan North, originating as a criticism of the SOLID principles above. SOLID products are more maintainable, scalable, testable, and reusable. By applying the SOLID principles, designers and developers can ensure that future updates are as pain-free as possible. However awesome your digital product on release, times change, user needs change, business priorities change, and the software will likely be updated, expanded, refactored, etc. The advantages of SOLID that made it so popular The idea here is to decouple the software’s modules, avoiding unnecessary dependencies, resulting in code that is more flexible and reusable. It states that the high-level module must not depend on the low-level module, but they should depend on abstractions” This encourages multiple, client-specific interfaces rather than attempting to extend the use of an existing interface.ĭependency inversion principle – “Entities must depend on abstractions, not on concretions. Interface segregation – “A client should never be forced to implement an interface that it doesn’t use, or clients shouldn’t be forced to depend on methods they do not use” Or, in other words, each derived class is substitutable for its parent class – similar to the open-closed principle, it ensures that extending derived classes cannot fundamentally change the behavior of the product. Then q(y) should be provable for objects y of type S where S is a subtype of T” Liskov substitution principle – “Let q(x) be a property provable about objects of x of type T. Open-closed principle – “Objects or entities should be open for extension but closed for modification”Īgain, with future changes in mind, each class should be capable of being extended (open) but its source code should not be changeable (closed). each class does just one thing, keeping the design as simple as possible and therefore future changes and updates are easier and less disruptive. The idea is that each individual class only has responsibility for one part of the software or digital product’s function i.e. Single responsibility principle – “A class should have one and only one reason to change, meaning that a class should have only one job” Martin in his 2000 paper “Design Principles and Design Patterns”, and later turned into an acronym by Michael Feathers, the ingredients are: The mnemonic acronym SOLID incorporates a set of software principles for object-oriented designs. KISS, YAGNI, DRY – three principles that every developer should know about What is SOLID and why is it more than just an acronym?
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