Each With Index

each_with_index gives a block both the current value and its position.

each_with_index.rb

start_number = 
items = ["red", "blue", "green"]

items.each_with_index do |item, index|
  label = "#{index + start_number}:#{item}"
  puts label
end

start_number = 
items = ["red", "blue", "green"]

items.each_with_index do |item, index|
  label = "#{index + start_number}:#{item}"
  puts label
end

start_number = 
items = ["red", "blue", "green"]

items.each_with_index do |item, index|
  label = "#{index + start_number}:#{item}"
  puts label
end

index-aware iteration Index-aware iteration is useful when output depends on position as well as value.