score = (x) -> 
  if x == "Yes"
    10
  else
    0
  
weights = [0.25, 0.25, 0.25, 0.25]
indigenous_peoples_rights = [commitment, impact_identification, requirements, practices]

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