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Class: Integer

Relationships & Source Files
Inherits: Object
Defined in: lib/prime.rb

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Class Method Details

.each_prime(ubound, &block)

Iterates the given block over all prime numbers.

See ::Prime#each for more details.

[ GitHub ] 

  


# File 'lib/prime.rb', line 48



def Integer.each_prime(ubound, &block) # :yields: prime
  Prime.each(ubound, &block)
end


  








  

    .from_prime_division(pd)  
  



  

    

Re-composes a prime factorization and returns the product.



See Prime#int_from_prime_division for more details.


  



  [ GitHub ]


  

  


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



def Integer.from_prime_division(pd)
  Prime.int_from_prime_division(pd)
end


  







Instance Attribute Details



  

    #prime?  ⇒ Boolean  (readonly)
  



  

    

Returns true if self is a prime number, else returns false.


  





  


  [ GitHub ]


  

  


# File 'lib/prime.rb', line 34



def prime?
  return self >= 2 if self <= 3
  return false if self % 2 == 0 or self % 3 == 0
  (5..(self**0.5).floor).step(6).each do |i|
    if self % i == 0 || self % (i + 2) == 0
      return false
    end
  end
  true
end


  







Instance Method Details



  

    #prime_division(generator = Prime::Generator23.new)  
  



  

    

Returns the factorization of self.



See Prime#prime_division for more details.


  



  [ GitHub ]


  

  


# File 'lib/prime.rb', line 29



def prime_division(generator = Prime::Generator23.new)
  Prime.prime_division(self, generator)
end