Ruby/Statement/in

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For each element in an array

for element in ["a", "b", "c"]
  puts element
end
# a
# b
# c



For each element in a range

for element in (1..3)
  puts element
end
# 1
# 2
# 3



Use for to loop through array index

array = ["cherry", "strawberry", "orange"]
for index in (0...array.length)
  puts "At position #{index}: #{array[index]}"
end
Источник — «http://wiki.crossplatform.ru/index.php/Ruby/Statement/in»