Ruby Tips

conversions.rb

# convert to integer: 12, 0x03
# raise an error if the string contains something other that a valid number
n = Integer(string)

option parsing.rb

require 'optparse'

options = Hash.new

options_parser = OptionParser.new do |opts|
  opts.on("-o", "--option [ARG]", String, "Optionnal argument") do |opt|
    app['option'] = opt
  end
  
  opts.on("-o", "--option ARG", String, "Required argument") do |opt|
    app['option'] = opt
  end
  
end

begin
  options_parser.parse!(ARGV)
rescue OptionParser::ParseError => e
  puts e
end