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SOLID je 5 základních principů objektově orientovaného programování a designu.

S	SRP	Single responsibility principle a class should have only a single responsibility (i.e. only one potential change in the software's specification should be able to affect the specification of the class)
O	OCP	Open/closed principle “software entities … should be open for extension, but closed for modification.”
L	LSP	Liskov substitution principle “objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.” See also design by contract.
I	ISP	Interface segregation principle “many client-specific interfaces are better than one general-purpose interface.”^[8]
D	DIP	Dependency inversion principle one should “Depend upon Abstractions. Do not depend upon concretions.”^[8] Dependency injection is one method of following this principle.

Zásady se používají v úmyslu, aby bylo více pravděpodobné, že programátor vytvoří systém, který se snadno udržuje a rozšířuje v průběhu času.

Lucka Žoltá