From: Ammar Ali <ammarabuali@...>
Date: 2010-11-13T21:40:12+09:00
Subject: Re: help sorting objects by their instance field

Hmmm. for some reason my reply never made it.

On Sat, Nov 13, 2010 at 2:38 PM, Ammar Ali <ammarabuali@gmail.com> wrote:
> On Sat, Nov 13, 2010 at 2:17 PM, Aaron Haas <aaron4osu@gmail.com> wrote:
>> I re-did the print method as you suggested but it is not sorting by the
>> persons last name. It is just printing in the order in which they were
>> added to array.
>> Here is my print method
>>
>> # sort and print addresses in alphabetical order
>>    def print_addresses
>>      @persons.sort_by {|person| person.lname}  # sorts list by lname
>>      @persons.each { |p| puts p }  # prints address book
>>
>>    end
>
> Remember, I gave incorrect information, so the sort is not "saved" in
> the array, so you need to make a copy:
>
> def print_addresses
>  sorted_persons = @persons.sort_by {|person| person.lname}
>  sorted_persons.each { |p| puts p }
> end
>
> Or, you can do it all on one line:
>
> @persons.sort_by {|person| person.lname}.each {|p| puts p}
>
> Regards,
> Ammar