Rails - Aug 2005 - Php like str_pad_left() function in Ruby

Philippe Creytens wrote:
> Am I correct in understanding that Ruby has no
> equivalent function to the php str_pad_left function?
> I want to convert a string from say "1" to "0001" and
> pad for x char with zeroes.
> 
> --PC
You can use sprintf to format strings.
irb(main):001:0> x = "1"
=> "1"
irb(main):002:0> sprintf "%04d", x.to_i
=> "0001"

So you could do something like the following:
def str_pad_left(str, pad)
	sprintf "%0#{pad}d", str.to_i
end

Hope that helps.

Am I correct in understanding that Ruby has no
equivalent function to the php str_pad_left function?
I want to convert a string from say "1" to "0001" and
pad for x char with zeroes.

--PC


		
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On 8/23/05, Philippe Creytens
<pcreytens-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
wrote:
> Am I correct in understanding that Ruby has no
> equivalent function to the php str_pad_left function?
> I want to convert a string from say "1" to "0001" and
> pad for x char with zeroes.
I generally use a combination of String#rjust and #gsub, i.e:

    my_string.rjust( 4 ).gsub( '' '', ''0'' )

If you use it regularly, you could always override #rjust to remove
the need for the #gsub:

    class String
      alias_method :space_padded_rjust, :rjust
      def rjust( length, char = '' '' )
        space_padded_rjust( length ).gsub( '' '', char )
      end
    end

-- 
Regards,
John Wilger

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