From: Aaron Haas <aaron4osu@...>
Date: 2010-11-14T07:18:06+09:00
Subject: Re: help sorting objects by their instance field

Nathan Clark wrote in post #961001:
> Check the docs for class Array
> http://ruby-doc.org/core/classes/Array.html#M002185
>
> You can pass a block to array.sort, that tells it what to sort by (in
> your case, person.lname).

Is this what you mean?  I also tried this and I'm getting the following 
error

def print_addresses(&block)
         @persons.sort_by { |p| persons.lname  }
         @persons.each { |p| yield p }
       end

error...



Ruby2.rb:113:in `print_addresses': undefined local variable or method 
`persons' for #<AddressBook:0x10014c750> (NameError)
  from COMP205_8-1Ruby2.rb:222:in `sort_by'
  from COMP205_8-1Ruby2.rb:113:in `each'
  from COMP205_8-1Ruby2.rb:113:in `sort_by'
  from COMP205_8-1Ruby2.rb:113:in `print_addresses'
  from COMP205_8-1Ruby2.rb:219

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