Example II for the Post - avoiding-conditionals

sample_03.rb

def extract_params(state, params)
  if state == :in_progress
    return params.select { |k, v| [:key_a, :key_b].include?(k) }
  elsif state == :done
    return params.select { |k, v| [:key_c, :key_d].include?(k) }
  elsif state == :on_review
    return params.select { |k, v| [:key_e, :key_f].include?(k) }
  end
end

params = { key_a: 1, key_b: 2, key_c: 3, key_d: 4, key_e: 5, key_f: 6 }

extract_params(:in_progress, params)    #=> { key_a: 1, key_b: 2 }
extract_params(:done, params)           #=> { key_c: 3, key_d: 4 }
extract_params(:on_review, params)      #=> { key_e: 5, key_f: 6 }