This document provides examples of Ruby code using loops, iterators, and conditional statements. It shows how to iterate from 1 to 10 using for loops, each loops, and upto methods. It also demonstrates how to sum the numbers from 1 to 10 using inject and how to set default options that can be overridden. It includes examples of using if/unless and ||= to check for nil values and set defaults.

1. Ruby

2. for i in (1..10)
puts i
end
=======
(1..10).each{ |i| puts i}
1.upto(10){|i| putsi|

3. inject
(1..10).inject(){|sum, item| sum += item}
(1..10).inject(1){|sum, item| sum += item}

4. def image(opt={})
default_opt = {:width=>300, :height=>200}
default_opt.merge!opt
end

5. number =1 if number.nil?
number =1 unless number
======
number ||=1

6. if __FILE__ == $0
end
if $PROGRAME_NAME == __FILE__
end