Is it possible to check to the position of an iterator in Ruby? [duplicate]

Question

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How to get the array index or iteration number with an each iterator? (2 answers)

Closed 7 years ago.

Is there a way to get the position of an iterator (how many times it has iterated)?

values = (1..100)
values.each do |value|
  if ... % 10 == 1 then puts iterator.count end
end

Or do you have to count explicitly:

values = (1..100)
counter = 0
values.each do |value|
  if counter % 10 == 1 then puts counter end
  counter += 1
end

Is there a cleaner approach?

Ruby 1.9.2

Answer 1

Use each_with_index

values.each_with_index do |value, idx|
  puts idx if idx % 10 == 1
  # do something else
end

Or you can use a cooler alternative

values.each.with_index do |value, idx|
  # work
end

I called it cooler because #with_index is relatively less known and it can be combined with map (and other methods) to yield interesting results.