ruby looping

looping.rb

arr = [ 2, 4, 6, 1, 7, 9]

arr.each do |element|
  puts "I'm #{element}."
end

arr.each_with_index do |element, index|
  puts "#{element} has index #{index}"
end



3.times do 
  puts 'ok'
end

arr.length.times do |index|
  puts "#{arr[index]} has index #{index}"
end

something = true
while something  do # while something is true
  puts "Do stuff"
  something = false if gets.chomp == 'stop'
end

something_else = false

until something_else do  # do this block until something_else is true
  puts "Do stuff"
  something_else = true if gets.chomp == 'stop'
end