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These 5 principles were introduced by Robert C. Martin (Uncle Bob), in\na paper Design Principles and Design Patterns in 2000. The actual SOLID\nacronym was, however, identified later by Michael Feathers. The intention of\nthese principles is to make software designs more understandable, easier to\nmaintain and easier to extend. As a software engineer, these 5 principles are\nessential to know!",[300,301,303],"h2",{"id":302},"s-single-responsibility-principle","S — Single responsibility principle",[296,305,306],{},"In programming, the Single Responsibility Principle states that every module\nor class should have responsibility over a single part of the functionality\nprovided by the software. You may have heard the quote: “Do one thing and do\nit well”. This refers to the single responsibility principle. In the article\nPrinciples of Object Oriented Design, Robert C. Martin defines a\nresponsibility as a ‘reason to change’, and concludes that a class or module\nshould have one, and only one, reason to be changed.",[300,308,310],{"id":309},"o-openclosed-principle","O — Open\u002Fclosed principle",[296,312,313],{},"In programming, the open\u002Fclosed principle states that software entities\n(classes, modules, functions, etc.) should be open for extensions, but closed\nfor modification. If you have a general understanding of OOP, you probably\nalready know about polymorphism. We can make sure that our code is compliant\nwith the open\u002Fclosed principle by utilizing inheritance and\u002For implementing\ninterfaces that enable classes to polymorphically substitute for each other.",[300,315,317],{"id":316},"l-liskov-substitution-principle","L — Liskov substitution principle",[296,319,320],{},"This one is probably the hardest one to wrap your head around when being\nintroduced for the first time. In programming, the Liskov substitution\nprinciple states that if S is a subtype of T, then objects of type T may be\nreplaced (or substituted) with objects of type S. This can be formulated\nmathematically as",[322,323,324,328],"ul",{},[325,326,327],"li",{},"Let ϕ(x) be a property provable about objects x of type T.",[325,329,330],{},"Then ϕ(y) should be true for objects y of type S, where S is a subtype of T.",[296,332,333],{},"More generally it states that objects in a program should be replaceable with\ninstances of their subtypes without altering the correctness of that program.",[300,335,337],{"id":336},"i-interface-segregation-principle","I — Interface segregation principle",[296,339,340],{},"This principle is fairly easy to comprehend. In fact, if you’re used to using\ninterfaces, chances are that you’re already applying this principle. If not,\nit’s time to start doing it! In programming, the interface segregation\nprinciple states that no client should be forced to depend on methods it does\nnot use. Put more simply: Do not add additional functionality to an existing\ninterface by adding new methods. Instead, create a new interface and let your\nclass implement multiple interfaces if needed.",[300,342,344],{"id":343},"d-dependency-inversion-principle","D - Dependency inversion principle",[296,346,347],{},"In programming, the dependency inversion principle is a way to decouple\nsoftware modules. This principle states that",[322,349,350,353],{},[325,351,352],{},"High-level modules should not depend on low-level modules. Both should\ndepend on abstractions.",[325,354,355],{},"Abstractions should not depend on details. Details should depend on\nabstractions.",[296,357,358],{},"To comply with this principle, we need to use a design pattern known as a\ndependency inversion pattern, most often solved by using dependency injection.\nDependency injection is a huge topic and can be as complicated or simple as\none might see the need for. Typically, dependency injection is used simply by\n‘injecting’ any dependencies of a class through the class’ constructor as an\ninput parameter.",[360,361,363],"h3",{"id":362},"by-applying-these-5-principles-that-make-the-solid-acronym-we-get-to-benefit-from-a-reusable-maintainable-scalable-and-easy-testable-codebase","By applying these 5 principles that make the SOLID acronym, we get to benefit from a reusable, maintainable, scalable and easy testable codebase.",[296,365,366],{},"Disclaimer : The views and opinions expressed in the article belong solely to the\nauthor, and not necessarily to the author's employer, organisation, committee\nor other group or individual.",{"title":368,"searchDepth":369,"depth":369,"links":370},"",2,[371,372,373,374,375],{"id":302,"depth":369,"text":303},{"id":309,"depth":369,"text":310},{"id":316,"depth":369,"text":317},{"id":336,"depth":369,"text":337},{"id":343,"depth":369,"text":344,"children":376},[377],{"id":362,"depth":378,"text":363},3,"2020-11-08","A brief explanation of the SOLID design principles by Uncle Bob.","md","\u002Fassets\u002Fimages\u002Fblog\u002F091120\u002Ftitle.jpg",{},4,true,{"title":130,"description":380},"g7_0hAfqJCXbWqx0kkLiFCrQb7BpLDMgixzAzmcEDFQ",[389,392],{"path":115,"title":114,"description":390,"date":391},"The fourth industrial revolution.","2020-11-15",{"path":175,"title":174,"description":393,"date":394},"Best practices for software engineers.","2020-11-01",1790439209359]