Book Image

Agile Technical Practices Distilled

By : Pedro M. Santos, Marco Consolaro, Alessandro Di Gioia
Book Image

Agile Technical Practices Distilled

By: Pedro M. Santos, Marco Consolaro, Alessandro Di Gioia

Overview of this book

The number of popular technical practices has grown exponentially in the last few years. Learning the common fundamental software development practices can help you become a better programmer. This book uses the term Agile as a wide umbrella and covers Agile principles and practices, as well as most methodologies associated with it. You’ll begin by discovering how driver-navigator, chess clock, and other techniques used in the pair programming approach introduce discipline while writing code. You’ll then learn to safely change the design of your code using refactoring. While learning these techniques, you’ll also explore various best practices to write efficient tests. The concluding chapters of the book delve deep into the SOLID principles - the five design principles that you can use to make your software more understandable, flexible and maintainable. By the end of the book, you will have discovered new ideas for improving your software design skills, the relationship within your team, and the way your business works.
Table of Contents (31 chapters)
Free Chapter
Section 1
Section 2
Section 3
Section 4
Chapter 21
License: CyberDojo

Cohesion and Coupling as Forces

We can use the gravity force as an analogy for cohesion and coupling. Cohesion would be planet Earth's gravity, pulling everything inward. Coupling would be the Sun, pulling planet Earth and keeping it in its orbit.

Using this analogy, too much cohesion would create a black hole, and too little cohesion would create a barren planet, unable to support life as we know it. The same applies for coupling. Too much coupling and planets would collide with each other or would be swallowed by the Sun; too little coupling and we would not have the Solar System because each planet would wander by itself in the Universe.

Coupling and cohesion are in reality the same force. Cohesion is felt inwards and coupling outwards. We believe this to be the fundamental force in object-oriented design, just as gravity is the essential force in Newton's laws. The secret to great design is finding a good balance between cohesion and coupling.