Write a simple cipher that will take a string and replace each letter in the range a-z with the corresponding character 13 steps along the alphabet.

Question

Sigiloso · Accepted Answer

Doesn't wrap around. I think what you're looking for is: 
def cipher(string)
   a = 'a'.ord
   string.chars.each_with_index do |char, index|
       string[index] = ((char.ord  - a + 13) % (26) + a).chr
   end
end

For anyone who is interested: · Answer

def cipher(string)
   string.chars.each_with_index do |char, index|
       string[index] = (char.ord + 13).chr
   end
end

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