gistfile1.txt

Calculating -------------------------------------
           5 chained    631.600k (± 4.7%) i/s -      3.199M in   5.077472s
            5 single    494.294k (± 4.6%) i/s -      2.480M in   5.029235s

Comparison:
           5 chained:   631600.1 i/s
            5 single:   494294.0 i/s - 1.28x  slower

Calculating -------------------------------------
       1,000 chained    626.506k (± 4.3%) i/s -      3.173M in   5.074975s
        1,000 single    494.182k (± 4.7%) i/s -      2.472M in   5.014008s

Comparison:
       1,000 chained:   626505.6 i/s
        1,000 single:   494181.9 i/s - 1.27x  slower

Calculating -------------------------------------
     100,000 chained      4.408k (± 7.1%) i/s -     22.048k in   5.027531s
      100,000 single      2.479k (± 8.2%) i/s -     12.528k in   5.090002s

Comparison:
     100,000 chained:     4408.5 i/s
      100,000 single:     2478.8 i/s - 1.78x  slower

methods.rb

def low_answers_for_question(question)
  answers.select(&for_question(question)).select(&:low?)
end

def low_answers_for_question_one_iteration(question)
  answers.select do |answer|
    for_question(question) && answer.low?
  end
end