From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-11-14T07:45:51+09:00
Subject: Re: help sorting objects by their instance field

On Sat, Nov 13, 2010 at 11:18 PM, Aaron Haas <aaron4osu@gmail.com> wrote:
> 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

persons is undefined here, you have to use p (btw, I'd use person
instead). But I think what Nathan means is what was already said:


def print_addresses
  @persons.sort_by {|person| person.lname}.each {|person| puts person}
end

He was talking about the block passed to the Array#sort_by method.

Jesus.