From: Marc Heiler <shevegen@...>
Date: 2008-12-22T19:20:36+09:00
Subject: Re: Using ruby hash on array

> I have no idea what the %20s ...... is doing.

The format delimiters are quite common in the whole "programming world".

I.e. c printf and so on.

For example:

  "%-9s"  % "12251"  # => "12251    "
  "%9s"   % "12251"  # => "    12251"
  "%09d"  % 12251    # => "000012251"
  "%015d" % "123456" # => "000000000123456"
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