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Ophir Frieder - Computer Science Programming Basics in Ruby

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Ophir Frieder Computer Science Programming Basics in Ruby

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If you know basic high-school math, you can quickly learn and apply the core concepts of computer science with this concise, hands-on book. Led by a team of experts, youll quickly understand the difference between computer science and computer programming, and youll learn how algorithms help you solve computing problems.Each chapter builds on material introduced earlier in the book, so you can master one core building block before moving on to the next. Youll explore fundamental topics such as loops, arrays, objects, and classes, using the easy-to-learn Ruby programming language. Then youll put everything together in the last chapter by programming a simple game of tic-tac-toe.Learn how to write algorithms to solve real-world problems Understand the basics of computer architecture Examine the basic tools of a programming language Explore sequential, conditional, and loop programming structures Understand how the array data structure organizes storage Use searching techniques and comparison-based sorting algorithms Learn about objects, including how to build your own Discover how objects can be created from other objects Manipulate files and use their data in your software

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Computer Science Programming Basics with Ruby
Ophir Frieder
Gideon Frieder
David Grossman
Preface

Computer science introductory texts are often unnecessarily long. Many exceed 500 pages, laboriously describing every nuance of whatever programming language they are using to introduce the concepts.

There is a better way: a programming language that has a low entry barrier. Preferably, the language selected should be a real, widely used language with a subset that is powerful and useful, yet mercifully small. Such a choice should arm the readers with marketable tools. The esoteric details of the programming language, however, should be ignored but with pointers for future investigation provided.

Ruby is a programming language well suited to this task. It is object-oriented, interpreted, and relatively straightforward. More so, instead of being purely educationally oriented, its popularity in industry is steadfastly growing.

Our book should be covered in sequential fashion. Each chapter assumes that the material from the preceding chapters has been mastered. To focus the discussion, we ignore gory details, such as user interface design and development issues, that we believe are ancillary to the core of computer science. Such issues should be, and are, covered in depth in a variety of subsequent courses.

Our target audience is students and practitioners who wish to learn computer science using Ruby rather than just how to program in a given language. This book consistently emphasizes why computer science is different from computer programming. Students and practitioners must understand what an algorithm is and what differentiates differing algorithms for the same task. Although we are living in an era of growing computational resources, we are also living in a world of growing data sets. Data amass every day; thus, efficient algorithms are needed to process these data.

Students and practitioners completing a course using this book possess foundational knowledge in the basics of computer science and are prepared to master abstract and advanced concepts. Second semester courses should rely on languages other than Ruby, furthering the understanding that programming languages are just interchangeable, expressive tools. We know, however, that many students and practitioners may not take another computer science course. If that is the case, this book provides them with an overview of the field and an understanding of at least one popular programming language that happens to be useful from both a practical and a pedagogical standpoint.

Concepts taught in this book provide students and practitioners with a sufficient foundation to later learn more complex algorithms, advanced data structures, and new programming languages.

Finally, we hope to instill a core appreciation for algorithms and problem solving so students and practitioners will solve problems with elegance and inspiration rather than simply plowing ahead with brute force.

The slides corresponding to this book and the source code listed in the book are available at http://ir.cs.georgetown.edu/Computer_Science_Programming_Basics_with_Ruby.

Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

Indicates new terms, URLs, email addresses, filenames, and file extensions

Constant width

Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords

Constant width bold

Shows commands or other text that should be typed literally by the user

Constant width italic

Shows text that should be replaced with user-supplied values or by values determined by context

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Using Code Examples

This book is here to help you get your job done. In general, you may use the code in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Computer Science Programming Basics in Ruby by Ophir Frieder, Gideon Frieder, and David Grossman (OReilly). Copyright 2013 Ophir Frieder, Gideon Frieder, and David Grossman, 978-1-449-35597-5.

If you feel your use of code examples falls outside fair use or the permission given here, feel free to contact us at .

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How to Contact Us

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Acknowledgments

Gone are the days where one needs to set the stage with computers are everywhere or computers are a commodity. Clearly, computers are everywhere, are used by everyone, and permeate every daily function and activity. Unfortunately, the majority of society can only use ready-made computer applications; they cannot program computers. With this book, we intend to change that!

In authoring this book, a five-year process, we benefited from and are grateful for the help of many; here we name but a few and apologize to those whose help we inadvertently forgot to acknowledge by name.

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