Ruby Programming

Duration: 3 days
Type: intermediate

Description

Ruby is a fully object oriented, dynamically typed scripting language. It has matured and expanded rapidly since its power was showcased by the 'Ruby on Rails' web framework. Today it is both the de facto replacement for the Perl scripting language and an increasingly important part of the Java and .NET platforms (via the JRuby and IronRuby interpreters).

This course provides experienced developers with everything they need to start using Ruby in production applications. The complete syntax of the language is covered, including detailed discussion of patterns, idioms and programming styles. Following this the course explores standard libraries and tools, and concludes with in-depth coverage of the JRuby interpreter and Java/Ruby integration.

Prerequisites

Delegates must be experienced software developers with a minimum of three years programming experience in languages such as Java, C#, Perl and Python.

List of Modules

Introduction to Ruby

A brief history of the Ruby language
Comparing Ruby to Perl and Python
The available Ruby interpreters
Scenarios where Ruby is best

Key Characteristics of Ruby

Everything is an object
Dynamically typed
Flexible syntax and DSL's
Lambdas and closures
Metaprogramming support

Basic Ruby Constructs

Types, literals and keywords
Block structure and operators
Conditionals and loop constructs
Working with strings and characters
The symbol table and symbol literals
Declaring and running regular expressions
The array and hash collection types

Basic Object Orientation

Classes, objects and references
Declaring classes with methods
Adding fields via constructors
Using attributes to define accessors
Visibilities supported by Ruby
Testing objects for equality
Converting between object types
Creating derived classes
Overriding inherited methods

Advanced Object Orientation

Using modules as namespaces and mixins
Declaring class level fields and methods
Creating class instance variables
Understanding singleton methods
Defining constant values in classes
Operator overloading and aliases
Using variable length argument lists
Raising and catching exceptions

Procs, Lambdas and Closures

Passing block arguments into methods
Creating and invoking procs and lambdas
Defining lambdas as literals in Ruby 1.9
How closures extend the lifetime of variables
Practical examples of using closures

Reflection and Metaprogramming in Ruby

Examining an object via introspection
Using Method objects to list and call methods
Handling unknown methods with method_missing
Dynamically adding methods via class_eval and define_method
Tracing type loading and program execution

Libraries Supplied with Ruby

Loading, reading and manipulating files
Creating multithreaded applications
Manipulating dates and times

Advanced Programming in Ruby

Applying functional programming styles in Ruby
Using Ruby to create Domain Specific Languages

Useful Ruby Tools

Listing, installing and updating RubyGems via the gem command
TDD usingTest::Unit, Mocha and RSpec
Integration testing Web Applications using Watir
Automating your build environment using Rake
Building web applications via 'Ruby On Rails'

The JRuby Implementation of Ruby

Why does the Java platform need Ruby?
Writing Ruby programs using JRuby
Invoking JRuby scripts from Java
Using and extending Java classes and interfaces
Converting between Ruby and Java types
Using Ruby and JRuby in Ant buildfiles
Building web applications via 'JRuby on Rails'