SOLID
In depthConcept
Five design principles (Single Responsibility, Open/Closed, Liskov, Interface Segregation, Dependency Inversion) for maintainable code.
SOLID, explained
Written by EduVerseWhat it is
SOLID is a set of five design principles for object-oriented code: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation and Dependency Inversion. They’re guidelines, not laws. Together they push you towards small classes with one clear job that depend on abstractions rather than on concrete details.
Why teams use it
Code that does too much in one place becomes scary to change: fixing one thing breaks another, and tests need half the application to run. SOLID gives a team shared words for spotting those problems in a review and for splitting code so that changes stay local.
An example from work
In a code review someone notes that your InvoiceService calculates totals, builds the PDF and sends the email, and calls it a Single Responsibility problem. You split it into three classes, and suddenly testing the price calculation no longer needs a mail server.
Our own explanation, not a quote from the book.
In the book
Sentences from The Software Realm, Decoded that mention SOLID, exactly as printed.
1 more passages about SOLID in the full book
Read every conversation where SOLID comes up, with the interactive slides and demos.
Where it fits
Object-oriented design, clean architecture
Coverage in the book
Covered in depth: multiple pages with explanations, examples and simulations.
