From: Dave Thomas <Dave@...>
Date: 2001-06-19T06:28:35+09:00
Subject: [ruby-talk:16609] Re: Creating arrays

Chris Moline <ugly-daemon@home.com> writes:

> Ah. Well to be honest that kinda sucks :). I was trying to write a
> method to print out pascal's triangle and kept getting error:
> undefined method []= for nil until I finally remembered we have to
> assign to [] first. grrr :)

I don't know if it helps, but the Perl idiom ||= works in Ruby too:

   fred[i] ||= []

assigns an empty array to fred[i] if fred[i] isn't already initialized.



Dave