String+char, cant convert nil, but not nil

ruby-talk
1

tryong to do a ROT13(http://en.wikipedia.org/wiki/Rot_13) encrypter/
decrypter.

x = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
y = "NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm"
arr = x.split(//).zip(y.split(//))
dict = Hash[*arr.flatten]

puts "Input phrase: "
phrase = gets

rotated = ""
for x in (0..phrase.length()-1)
        rotated = rotated + dict[phrase[x].chr]
end
puts rotated

'+' cant convert nil into string
cant convert nil into string

puts dict[phrase[2].chr] works though...

2

# tryong to do a ROT13(http://en.wikipedia.org/wiki/Rot_13) encrypter/
# decrypter.
# x = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
# y = "NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm"
# arr = x.split(//).zip(y.split(//))
# dict = Hash[*arr.flatten]
# puts "Input phrase: "
# phrase = gets

if you tried this in irb, you'd see the value of phrase.
hint: gets also stores the (unwanted) ending char
(chomp the newline pls :slight_smile:

# rotated = ""
# for x in (0..phrase.length()-1)
# rotated = rotated + dict[phrase[x].chr]
# end
# puts rotated

···

From: notnorwegian@yahoo.se [mailto:notnorwegian@yahoo.se]
#
# '+' cant convert nil into string
# cant convert nil into string

that's the effect

dict["\n"]
#=> nil

btw, in ruby, there are many ways to skin that rot13 problem.

eg,

"testing".tr('A-MN-Za-mn-z','N-ZA-Mn-za-m')
#=> "grfgvat"

kind regards -botp