#### 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.
Preface
Free Chapter
Section 1
Chapter 1
Chapter 2
Chapter 4
Chapter 5
Section 2
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Section 3
Chapter 11
Chapter 13
Chapter 14
Chapter 15
Section 4
Chapter 16
Chapter 17
Chapter 19
Chapter 20
Chapter 21
Chapter 22
Chapter 23
Sample Solutions
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# Katas

Use your new habits when solving the katas. Start from the assertion and work backward. Organize your tests into arrange, act, and assert blocks. Follow the unit test principles we just looked at.

## Stats Calculator by cyber-dojo

Your task is to process a sequence of integer numbers to determine the following statistics:

• Minimum value
• Maximum value
• Number of elements in the sequence
• Average value

For example: [`6`, `9`, `15`, `-2`, `92`, `11`]

• Minimum value = `-2`
• Maximum value = `92`
• Number of elements in the sequence = `6`
• Average value = `21.833333`

## Anagrams by cyber-dojo

Write a program to generate all potential anagrams of an input string.

For example, the potential anagrams of `biro` are:
• `biro` `bior` `brio` `broi` `boir` `bori`
• `ibro` `ibor` `irbo` `irob` `iobr` `iorb`
• `rbio` `rboi` `ribo` `riob` `roib` `robi`