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Under normal circumstances, try to use each:

1.upto(10).each { |i| puts i }
puts i # NameError: i is undefined

When using for:

for i in 1.upto(10) do
  puts i
end
puts i # print 10

It seems there is no difference, there are usually multiple ways to do one thing in ruby

each do is more efficient. Some programming standards generally do not recommend using for in

This is a matter of programming style. The each loop is a functional style, and the for loop is an imperative style
each is actually a method on an iterable object, accepting a block as a parameter
for is a loop structure implemented in the grammar