2 different ways to transform each element in an array.

sample_loop

# initial input
array = ["1", "2"]

# did you know that this code block?
final_array = array.map do | elm |
   elm.to_i
end

# does the same thing as this code block?
final_array = [ ]
array.each do |elm|
   final_array << elm.to_i
end


# and this is the final result: transforms
# array of strings to array of integer
final_array = [ 1, 2 ]