From: Vicente Bosch Campos <vbosch@...>
Date: 2011-03-23T18:44:33+09:00
Subject: Re: Dynamically calling a certain set of methods


Great,much better and concise... (I need to improve on my regexp)

Many thanks Robert!!


On Mar 23, 2011, at 10:26 AM, Robert Klemme wrote:

> On Wed, Mar 23, 2011 at 9:32 AM, Vicente Bosch Campos <vbosch@gmail.com> wrote:
>> Hi,
>> 
>> I am doing an implementation of a genetic algorithm to resolve a certain type of equations. I need to randomly call a certain method from a set:
>> 
>>    def mutation
>> 
>>      self.send(self.methods.select!{|element| element.to_s.end_with?("Mutation")}.shuffle![0])     #I'm using to_s as the symbol object do not allow end_with?
>> 
>>    end
>> 
>>    def operatorSwitchMutation
>>    end
>> 
>>    def numberSwitchMutation
>>    end
>> 
>>    def unusedNumberMutation
>>    end
>> 
>> 
>> Is self.send(self.methods.select!{|element| element.to_s.end_with?("Mutation")}.shuffle![0]) the best way to do it ? Is there a more ruby idiom to perform the safe thing ?
> 
> First of all you can save typing by removing "self.".  Then you should
> replace #shuffle![0] with #sample:
> 
> send(methods.select!{|element| element.to_s.end_with?("Mutation")}.sample)
> 
> If you like you can strip this down even further by using regular
> expressions because those happen to work with Symbols as well:
> 
> send(methods.grep(/Mutation\z/).sample)
> 
> :-)
> 
> Kind regards
> 
> robert
> 
> -- 
> remember.guy do |as, often| as.you_can - without end
> http://blog.rubybestpractices.com/
>