Example II Refactored for the Post - avoiding-conditionals

sample_04.rb

def extract_params(state, params)
  state_keys = {
    in_progress: %I[key_a key_b],
    done:        %I[key_c key_d],
    on_review:   %I[key_e key_f]
  }

  params.select { |k, v| state_keys[state].include?(k) }
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 }