Answer 1

If you don't need index of an element in a data structure and you only need the contained elements, it is easier using iterators.

myarray=[1,2,3]
for element in myarray
puts element
end

If you need the element index for some reason, you could do it like this:

for index in 0..myarray.size-1
# do something with index
puts myarray[index]
end

Or

myarray.each_index do |index|
# do something with index
puts myarray[index]
end