Strings to Integers

Question

Say you have the string \"Hi\". How do you get a value of 8, 9 (\"H\" is the 8th letter of the alphabet, and \"i\"

Answer 1

Preserving case and assuming you want to wrap around at "Z":

upper = [*?A..?Z]
lower = [*?a..?z]
LOOKUP = (upper.zip(upper.rotate) + lower.zip(lower.rotate)).to_h
s.each_char.map { |c| LOOKUP[c] }.join
#=> "Ij"