What is the DRY (Don't Repeat Yourself) principle?

The DRY principle (Don't Repeat Yourself) is a software development principle that states that each piece of information should have a single, unambiguous representation within a system.

Its goal is to avoid duplication of code and data. If logic or data is repeated in multiple places, changes in one place require corresponding changes elsewhere, increasing the risk of errors and maintenance complexity.

Advantages of applying DRY:

• Improved maintainability: Changes are made in one place.
• Fewer errors: Reduces the likelihood of introducing incompatible changes.
• Increased readability: Code becomes more understandable and structured.
• Accelerated development: New logic is built upon existing components.

Violating the DRY principle is often called WET (Write Everything Twice, We Enjoy Typing, or Waste Everyone's Time).