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Intermediate Topic 19 of 50 Software Engineering

DRY, KISS and YAGNI

Heuristics against duplication, complexity and speculation.

How it works

Don't Repeat Yourself keeps one source of truth, Keep It Simple favors straightforward solutions, You Aren't Gonna Need It avoids speculative features.

Where it is used

Everyday design decisions.

Common pitfall

Premature abstraction to remove "duplication" that is actually coincidental.

Where it fits in the course

DRY, KISS and YAGNI is topic 19 of 50 in Software Engineering, rated Intermediate. It follows SOLID Principles. The next topic is Design Patterns.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Software Engineering quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is DRY, KISS and YAGNI?
Heuristics against duplication, complexity and speculation. It belongs to Software Engineering and is an intermediate-level topic.
Where do people use DRY, KISS and YAGNI?
Everyday design decisions.
What is the most common mistake with DRY, KISS and YAGNI?
Premature abstraction to remove "duplication" that is actually coincidental.
What should I learn before this topic?
Start with SOLID Principles, the topic just before it in Software Engineering.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Software Engineering quiz.
Is DRY, KISS and YAGNI hard to learn?
It is an Intermediate topic. Be comfortable with the Beginner topics in this area first, then read the common pitfall carefully, since it is where most mistakes happen.
How long does it take to learn DRY, KISS and YAGNI?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to DRY, KISS and YAGNI?
SOLID Principles, Design Patterns, Software Maintenance are closely connected. The full list is in the related topics section of this page.
What should I study after DRY, KISS and YAGNI?
Continue with Design Patterns, the next topic in Software Engineering.

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