From: oinkoink <oinkoink+unet@...>
Date: 2007-02-09T08:30:10+09:00
Subject: Re: Iterators and blocks question

On Feb 8, 2:36 pm, Bharat Ruparel <brupa...@mercury.com> wrote:
> IO.foreach("test.txt") {|line| puts line}
>
> This works great.  However, I am trying to take the next step(s).  For
> starters, I would like to modify the above code such that it lets me
> prepend the line numbers to each line as it is listed to the console.
> Something similar to the listing below for example:
>
> 1.  First line from the file..
> 2.  Second line from the file...
> .
> .
> 12. Last line from the file.

> What is the Ruby idiom for doing this?  Using the iterator and the code
> block?

> Thanks in advance.
> Regards,
> Bharat

> Posted viahttp://www.ruby-forum.com/.

Namaste Bharat.
You might try something like
require 'mathn'
width = (Math.log((rl = IO.readlines("test.txt")).length)/
Math.log(10)).floor + 1
rl.each_with_index{ |line, k| print "%#{width}d. " % k  + line}

Regards, Bret