| Initial | Stands for
(acronym) | Concept |
| S | SRP |
- Single responsibility principle
- the notion that an object should have only a single responsibility.
|
|---|
| O | OCP |
- Open/closed principle
- the notion that “software entities … should be open for extension, but closed for modification”.
|
| L | LSP |
- Liskov substitution principle
- the notion that “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
- the notion that “many client specific interfaces are better than one general purpose interface.”[5]
|
| D | DIP |
- Dependency inversion principle
- the notion that one should “Depend upon Abstractions. Do not depend upon concretions.”[5]
Dependency injection is one method of following this principle.
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