DRY Principle in 100 Seconds

💡 What does DRY stand for?

DRY stand for Don't Repeat Yourself, a basic principle of software development aimed at reducing repetition of information.

👤 Origination

The principle has been formulated by Andy Hunt and Dave Thomas in their book The Pragmatic Programmer. It is stated as "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system".

⭐ Why DRY?

Write code once, use it often.
Change code in one place, see the change in all instances.
Less code is good: It saves time and effort, is easy to maintain, and also reduces the chances of bugs.

DRY Violations

Writing/ Copying and pasting the same code or logic again and again.

💡 How to DRY?

Divide your code and logic into smaller reusable units and use that code by calling it where you want.
Put business rules, long expressions, if statements, math formulas, metadata, etc. in only one place.