Book Image

Comprehensive Ruby Programming

By : Jordan Hudgens

Book Image

Comprehensive Ruby Programming

By: Jordan Hudgens

Overview of this book

Ruby is a powerful, general-purpose programming language that can be applied to any task. Whether you are an experienced developer who wants to learn a new language or you are new to programming, this book is your comprehensive Ruby coding guide. Starting with the foundational principles, such as syntax, and scaling up to advanced topics such as big data analysis, this book will give you all of the tools you need to be a professional Ruby developer. A few of the key topics are: object-oriented programming, built-in Ruby methods, core programming skills, and an introduction to the Ruby on Rails and Sinatra web frameworks. You will also build 10 practical Ruby programs. Created by an experienced Ruby developer, this book has been written to ensure it focuses on the skills you will need to be a professional Ruby developer. After you have read this book, you will be ready to start building real-world Ruby projects.

Preface

What this book covers

What you need for this book

Who this book is for

Reader feedback

Customer support

Free Chapter

Introduction to the Ruby Programming Language

Introduction to the Ruby Programming Language

Popular sites that use Ruby

Installing Ruby on a computer

Installing different Ruby versions with RVM

Ruby Variables

Using variables in Ruby

Printing to the Ruby console

Getting input from the Ruby console using gets and chomp

Variable scope and variable types

Ruby Strings

Using strings in Ruby

String interpolation guide for Ruby

String manipulation guide

A practical implementation

String substitution guide

Split, strip, and join guides for strings

Working with Numbers in Ruby

Working with Numbers in Ruby

Integer arithmetic guide

Arithmetic order of operations

Difference between integers and floats

Ruby Methods

Creating methods in Ruby

What does a Ruby method return?

What are the differences between class and instance methods in Ruby?

Ruby proc tutorial

The Ruby lambda tutorial

What is the difference between procs and lambdas in Ruby?

Guide to method arguments in Ruby

Using splat and optional arguments in Ruby methods

Ruby Iterators and Loops

Ruby Iterators and Loops

The while loop guide

The each iterator method tutorial

The for...in loops tutorial

Looping over a hash

Using the select method

Using the map method – part 1

Using the map method – part 2

Summing values in an array using the inject method

Ruby Collections

Ruby Collections

Deleting items from arrays

Using push and pop for arrays

The Ruby hash tutorial

Deleting elements from a hash

Iterating over a hash for a key or value

Top hash methods in Ruby

Ruby Conditionals

Ruby Conditionals

The conditionals guide

Syntax for the unless conditional

Nested if...else conditionals

Guide to compound conditionals

Object-Oriented Programming in Ruby

Object-Oriented Programming in Ruby

Introduction to how OOP works

Ruby OOP development – setters, getters, and methods

Working with instantiation in Ruby

Creating an initializer method in a Ruby class

The working of OOP inheritance

Overview of private versus public methods

The working of polymorphism and usage of super

Dead simple OOP

SOLID OOP development – the simple responsibility principle

SOLID OOP development – the open/closed principle guide and example

SOLID OOP development – the Liskov substitution principle

SOLID OOP development – the interface segregation principle

SOLID OOP development – the dependency inversion principle

Working with the Filesystem in Ruby

Working with the Filesystem in Ruby

Creating a file

Reading files into a program using the File class

Deleting a file

Appending a file

Error Handling in Ruby

Error Handling in Ruby

Error handling tutorial

Error handling – the best practices

Developing a custom error logger in Ruby

Regular Expressions in Ruby

Regular Expressions in Ruby

Regular expression code example

How to validate an IP address using regular expressions

How to develop a wheel of fortune game

Searching with grep in Ruby

Searching with grep in Ruby

How to use grep in Ruby

How to use grep instead of the select and map methods

Ruby Gems

Introduction to Ruby gems

How to research Ruby gems

Ruby Metaprogramming

Ruby Metaprogramming

Metaprogramming introduction

How to integrate metaprogramming techniques into a custom class

How to use metaprogramming for opening and customizing the String class

How Rails use metaprogramming for the find_by method

Utilizing metaprogramming with method_missing to create methods on the fly

Incorporating respond_to_missing to conform to metaprogramming best practices

Implementing metaprogramming with define_method

Ruby Web Frameworks

Ruby Web Frameworks

Sinatra web framework development

Introduction to the Ruby on Rails framework

Working with APIs in Ruby

Working with APIs in Ruby

How to work with APIs in Ruby

How to use the httparty Ruby gem

How to create a custom API connector in Ruby

How to parse an API in Ruby

Ruby Algorithms

Ruby Algorithms

Introduction to sorting algorithms

Implementing the bubble sort algorithm

Implementing the quick sort algorithm

Implementing the merge sort algorithm

Implementing a prime number counting algorithm

How to code the power digit sum algorithm

Implementing a humanize counting algorithm

Implementing a date algorithm

How to code a Fibonacci digit counter

Implementing a permutation algorithm

Implementing an amicable number algorithm

Implementing a factorial algorithm

Implementing an even Fibonacci number algorithm

Implementing the least common multiple

Machine Learning

Machine Learning

Big data analysis

Basic decision tree implementation

How to develop a big data analysis application in Ruby

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How to code the power digit sum algorithm

In this section, we are going to see how to solve a complex math problem that asks us to solve this question: what is the sum of the digits of the number 2 to the 1,000th power?

We can solve this problem with just one line of code in Ruby.

Start by running the equation 2 to the 1,000th power and then convert the value into a string:

p (2 ** 1000).to_s

If you execute this code, the output will be as follows:

"10715086071862673209484250490600018105614048117055336074437503883703510511249361224931983788156958581275946729175531468251871452856923140435984577574698574803934567774824230985421074605062371141877954182153046474983581941267398767559165543946077062914571196477686542167660429831652624386837205668069376"

This is the value of 2 to the power of 1,000. The next part of the code should add each digit and create a final sum.

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