Class: Integer

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

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.each_prime(ubound, &block) ⇒ Object

Iterates the given block over all prime numbers.

See Prime#each for more details.



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

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

.from_prime_division(pd) ⇒ Object

Re-composes a prime factorization and returns the product.

See Prime#int_from_prime_division for more details.



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

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

Instance Method Details

#prime? ⇒ Boolean

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

Returns:

  • (Boolean) 


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# 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

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

Returns the factorization of self.

See Prime#prime_division for more details.



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

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