From: Patrick Cotner <patrick@...>
Date: 2007-09-04T12:00:39+09:00
Subject: [solved]array of hashes: finding hash with min value for key

Stefan Rusterholz wrote:
> Patrick Cotner wrote:
>> I'm trying to write a proggy to help me figure out how long it will take
>> to pay off a credit card based on a payment value.
>> The card can have multiple sections with different owed amounts and
>> aprs.
>> Since the credit card companies pay off lower interest sections prior to
>> higher, I need to be able to determine which section has lowest apr. For
>> example
>> 
>> <code>
>> sections << { :type => "Purchases", :owed => 840.64, :apr => 0.2474 }
>> sections << { :type => "Transfers", :owed => 3453.45, :apr => 0.1774 }
>> 
>> </code>
>> 
>> I've set up a loop to iterate through each section and apply a finance
>> charge to the owed amounts.  I have a variable with my payment amount.
>> After applying the finance charge, i need to see if section[:apr] is the
>> lowest of all sections, in order to apply the payment to that section
>> only.
>> How would this be done?
>> 
>> -Patrick
> 
> ri Enumerable#min
> sections.min { |a,b| a[:apr] <=> b[:apr] }
> 
> Regards
> Stefan

Thanks, David, but I went with Stephan's example.
I posted the (ugly) finished code over here:
http://www.ruby-forum.com/topic/123523
Thanks, Stephan!
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