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programming/solid.md

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+---
+layout: default
+title: SOLID principles
+categories: programming
+---
+
+### Single responsibility principle
+
+This mean if the one thing in specification is changed you only need to change the code in the single place or class
+
+### Open/closed principle
+
+Software should be open for extension, but closed for modification.
+
+### Liskov substitution principle
+
+Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
+
+### Interface segregation principle
+
+The interfaces should be small and provide as little methods as possible.
+
+### Dependency inversion principle
+
+The lower module must not depends on higher module. In order to achieve this the code must to relay on abstractions (in other words the code has to use interfaces/protocols)