Ruby zerofill a string
printf, ruby, ruby-1.9.2
Solution
You can use `rjust` or `ljust`.
>> "12AD".rjust(10, '0')
#=> "00000012AD"
Problem
Formating an Integer to be filled with zeros is easy in Ruby: ``` sprintf( "%010d", 345 ) #=> "0000000345" ``` But when I try to fill a String with zeros I can't find an easy solution: ``` sprintf( "%010d", "12AD" ) #=> ArgumentError: invalid value for Integer(): "12AD" sprintf( "%010s", "12AD" ) #=> " 12AD" ``` I would like to obtain: ``` sprintf( "%010s", "12AD" ) #=> "00000012AD" ```