upto(...) public

Iterates through successive values, starting at str and ending at other_str inclusive, passing each value in turn to the block. The String#succ method is used to generate each value. If optional second argument exclusive is omitted or is false, the last value will be included; otherwise it will be excluded.

   "a8".upto("b6") {|s| print s, ' ' }
   for s in "a8".."b6"
     print s, ' '
   end

produces:

   a8 a9 b0 b1 b2 b3 b4 b5 b6
   a8 a9 b0 b1 b2 b3 b4 b5 b6
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