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  1. Practice
  2. Algorithms
  3. Warmup
  4. Plus Minus
  5. Discussions

Plus Minus

  • enriquedelgado + 2 comments

    Ruby :-]

    puts arr.count {|n| n > 0} / n.to_f
puts arr.count {|n| n < 0} / n.to_f
puts arr.count {|n| n == 0} / n.to_f
    • juliobetta + 0 comments

      Nice! Heads up for the methodfdiv. It's little-known but very useful.

      puts arr.count {|n| n > 0}.fdiv(n)
puts arr.count {|n| n < 0}.fdiv(n)
puts arr.count {|n| n == 0}.fdiv(n)
    • Adam0_0 + 0 comments

      A more readable way.

      arr_size = arr.size
[:positive?, :negative?, :zero?].each do |action|
	p arr.count(&action).to_f/arr_size
end