Class: PermutationGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/permutation_generator.rb

Overview

PermutationGenerator

Install

$ sudo gem install permutation_generator

Usage

require 'rubygems'
require 'permutation_generator'
PermutationGenerator.new(2, ["r", "b", "g"]).each do |element|
  p element
end 

# output -- ["r", "r"] ["r", "b"] ["r", "g"] ["b", "r"] ["b", "b"] ["b", "g"] ["g", "r"] ["g", "b"] ["g", "g"]

Copyright © 2010 MIT-LICENSE Author : Wayne Deng Web : blog.waynedeng.com Email : wayne.deng.cn(AT).com

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(picking_size, elements) ⇒ PermutationGenerator

Returns a new instance of PermutationGenerator.



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# File 'lib/permutation_generator.rb', line 22

def initialize(picking_size, elements)
  self.elements = elements
  self.size = picking_size
end

Instance Attribute Details

#elements ⇒ Object

Returns the value of attribute elements.



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# File 'lib/permutation_generator.rb', line 20

def elements
  @elements
end

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/permutation_generator.rb', line 20

def size
  @size
end

Instance Method Details

#each(&block) ⇒ Object 



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# File 'lib/permutation_generator.rb', line 27

def each (&block)
  (1..self.permutation_size).each do |i|
    yield self.ary(i-1)
  end
end

#each_with_index(&block) ⇒ Object 



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# File 'lib/permutation_generator.rb', line 33

def each_with_index (&block)
  (1..self.permutation_size).each do |i|
    yield self.ary(i-1), i-1
  end
end

#permutation_size ⇒ Object 



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# File 'lib/permutation_generator.rb', line 39

def permutation_size
  self.elements.size ** self.size
end