From: asdfasdf asdfasdf <lists@...>
Date: 2013-08-05T12:19:00+09:00
Subject: Why does the next() method behave this way?

I might be getting tripped up on something not important, but hopefully
one of y'all can help me understand this :)

What is a use case where you'd want next() to behave the way it does?

See this from irb:

puts "bay".next
baz

puts "baz".next
bba

puts "bzz".next
caa

puts "zzz".next
aaaa

puts "ZZZ".next
AAAA

The manual says this is because:
 "If the increment generates a “carry,” the character to the left of it
is incremented. This process repeats until there is no carry, adding an
additional character if necessary."
http://www.ruby-doc.org/core-2.0/String.html#method-i-next

Come again?  What exactly causes an increment to create a carry?  Is it
only z to a and Z to A?  Why?

Thanks!

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