Question

I’ve got a method that generates random strings:

def generate_letters(length)
    chars = 'ABCDEFGHJKLMNOPQRSTUVWXYZ'
    letters = ''
    length.times { |i| letters << chars[rand(chars.length)] }
    letters
  end

I want to map values to generated strings, e.g.(1):
A = 1, B = 2, C = 3 , e.g.(2):
if I generate ACB it equals to 132. Any suggestions?

Answer 1

You can use that for concatenating these values:

s = 'ACB'
puts s.chars.map{ |c| c.ord - 'A'.ord + 10 }.join.to_i
# => 101211

and to sum them instead use Enumerable#inject method (see docs, there are some nice examples):

s.chars.inject(0) { |r, c| r + (c.ord - 'A'.ord + 10) } # => 33

or Enumerable#sum if you’re doing it inside Rails:

s.chars.sum { |c| c.ord - 'A'.ord + 10 } # => 33