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| 1 | def caesar_cipher(str, shift = 5) | |
| 2 | alpha = ('a'..'z').to_a
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| 3 | shifted = [] | |
| 4 | ||
| 5 | str = str.split('')
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| 6 | str.each do |e| | |
| 7 | - | shifted << if e =~ /[A-Za-z]/ |
| 7 | + | shifted << case e |
| 8 | - | e == e.downcase ? alpha[alpha.index(e) - shift] : alpha[alpha.index(e)].upcase |
| 8 | + | when /[a-z]/ |
| 9 | alpha[alpha.index(e) - shift] | |
| 10 | when /[A-Z]/ | |
| 11 | alpha[alpha.index(e)].upcase | |
| 12 | else | |
| 13 | e | |
| 14 | end | |
| 15 | end | |
| 16 | ||
| 17 | shifted.join | |
| 18 | end |
