score = (x) -> 
  if x == "Yes"
    10
  else if x == "Partially"
    5
  else
    0

weights = [0.25, 0.125, 0.125, 0.25, 0.25]
assessments_of_impacts_on_nature = [impacts_on_nature, impacts_on_upstream_value_chain, impacts_on_downstream_value_chain, impacts_on_stakeholder, impacts_on_nature_including_biodiversity]

weights.reduce((weighted_sum, weight, index) -> 
              weighted_sum + weight*score(assessments_of_impacts_on_nature[index])
             , 0)