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Mastering Iterators and File Handling in Ruby: A Comprehensive Guide

This installment of the Ruby trilogy delves into creating iterators and file handling. Learn how to add iterator support by mixing in the Enumerable module, ensuring that your class can utilize powerful methods like `each`, `collect`, and `inject`. Discover how to read files line-by-line and process command-line arguments efficiently. We'll cover environment configurations and module locations, all aimed to enhance your Ruby programming skills. This guide is perfect for learners looking to deepen their understanding of Ruby's capabilities.

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Mastering Iterators and File Handling in Ruby: A Comprehensive Guide

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  1. Grabbag IV - the fourth installment of the Trilogy Learning Ruby - 14

  2. Creating Iterators • Adding iterator support (that is, .each, .collect, .inject, etc., etc.) is easy • Simply mixin the Enumerable class into your class • Use include Enumerable near the top of your class code • Create an each method that makes sense for your class

  3. Ethernet.each class Ethernet include Enumerable def each yield @dest yield @src yield @type_len yield @payload end # of each. ... end # of Ethernet.

  4. Slurping Files string_of_lines = IO::read( "/etc/passwd" ) array_of_lines = IO::readlines( "/etc/passwd" )

  5. Processing Command-line Args # Remember: all arguments are passed in as strings! ARGV.each { |arg| puts arg } option1, option2 = ARGV.collect { |arg| arg } if ARGV.length == 0 fail "Please supply some parameters!" end # of if.

  6. Environments and Configurations ENV.keys.each { |key| print "#{key} -> ", ENV[key], "\n" } ENV.collect() do |key, value| print "#{key} --> #{value} \n" end # of do require 'rbconfig' include Config CONFIG.keys.sort.each do |key| print "#{key} -> ", CONFIG[key], "\n" end # of do.

  7. Where Are My Modules? ruby -e 'puts $:' /usr/local/lib/site_ruby/1.8 /usr/local/lib/site_ruby/1.8/i486-linux /usr/local/lib/site_ruby/1.8/i386-linux /usr/local/lib/site_ruby /usr/lib/ruby/1.8 /usr/lib/ruby/1.8/i486-linux /usr/lib/ruby/1.8/i386-linux .

  8. More ... Ruby So Far Look for ways to do cool stuff with Ruby. For example: • A project proposal for 4th Year: Create a Ruby extension that allows for the manipulation of the Torque Game Engine from within any Ruby program.

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