CODEWITHSUNDEEP
rubylogicshuffle
Peter
Peter

Reputation: 13

Call shuffle method once and use output multiple times in ruby

I have two classes in two seperate files. The script starts by executing file domain.rb

In the first file (domain.rb) I have the following code: 

require 'message.rb'  

class Domain
def create_domain
  10.times do 
    puts "#{Message.site}"
   end
end

In the second file (message.rb) I have this peace of code:

class Message
   def self.site
     @site = [*('a'..'z'),*('0'..'9')].shuffle[0,7].join
     @site.concat("@example.com")
   end

   def other_method
     puts "#{Message.site} later in the text #{Message.site}"
   end
end

My Problem:

This way I'm executing the method .site three times ergo I'll receive 3 different outputs of shuffle method. 

[email protected]
[email protected]
[email protected]

My Question: How can I ensure I can use [email protected] three times ?

Upvotes: 0

Views: 60

Answers (1)

Aleksei Matiushkin
Aleksei Matiushkin

Reputation: 121000

Memoize the instance variable:

class Message
   def self.site
     @site ||= [*('a'..'z'),*('0'..'9')].
                 shuffle[0,7].
                 join.
                 concat("@example.com")
   end
   puts "#{Message.site} later in the text #{Message.site}"
end

Sidenote: Use Array#sample with an argument instead of shuffling:

class Message
   def self.site
     @site ||= [*('a'..'z'),*('0'..'9')].
                 sample(8).
                 join.
                 concat("@example.com")
   end
end

Upvotes: 2

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