From: Arslan Farooq <lists@...>
Date: 2013-07-09T15:14:34+09:00
Subject: Well-Grounded Rubyist -- Person class implementation in chapter 4 question

Hi,

I am new to programming and new to Ruby.

I have been studying Ruby using David Black's book, and I need bit of
help with this:

Code in listing 4.11, 4.12 and 4.13 needs to be pieced together (I
think) to do something useful. However it's a bit confusing... whether
they are meant to just studied as examples separately, or whether I am
supposed to piece them together. Please have a look at the code:

https://gist.github.com/arslanfarooq/54ac5aa7796385e4a063

If you could explain a bit what's going on in 4.13 that would be great.

On my computer I have combined the code in one file "person_class.rb"
and I am getting this error:

person_class.rb:17:in `has_friends': undefined method `<<' for
nil:NilClass (NoMethodError) from person_class.rb:43:in `<main>'

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