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  1. #!/usr/local/bin/ruby -w
  2.  
  3. class Integer
  4.   def prime?
  5.     (2..(Math.sqrt(abs).ceil)).none?{|n|abs % n == 0}
  6.   end
  7. end
  8.  
  9. p((10..50).select(&:prime?))
  10. p((-50..-10).select(&:prime?))
Success #stdin #stdout 0s 4760KB
comments (?)
stdin 
Standard input is empty
stdout 
[11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]
[-47, -43, -41, -37, -31, -29, -23, -19, -17, -13, -11]
https://ideone.com/ctJPo
language:
Ruby (ruby 2.5.5)
created:
12 years ago
visibility:
secret

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