content: on summed(a, b)
      a + b
  end summed
  
  on product(a, b)
      a * b
  end product
  
  -- TEST -----------------------------------------------------------------------
  on run
  
      set xs to enumFromTo(1, 10)
  
      {xs, ¬
          {sum:foldl(summed, 0, xs)}, ¬
          {product:foldl(product, 1, xs)}}
  
      --> {{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, {sum:55}, {product:3628800}}
  
  end run
  
  -- GENERIC FUNCTIONS ----------------------------------------------------------
  
  -- enumFromTo :: Int -> Int -> [Int]
  on enumFromTo(m, n)
      if n < m then
          set d to -1
      else
          set d to 1
      end if
      set lst to {}
      repeat with i from m to n by d
          set end of lst to i
      end repeat
      return lst
  end enumFromTo
  
  -- foldl :: (a -> b -> a) -> a -> [b] -> a
  on foldl(f, startValue, xs)
      tell mReturn(f)
          set v to startValue
          set lng to length of xs
          repeat with i from 1 to lng
              set v to |λ|(v, item i of xs, i, xs)
          end repeat
          return v
      end tell
  end foldl
  
  -- Lift 2nd class handler function into 1st class script wrapper
  -- mReturn :: Handler -> Script
  on mReturn(f)
      if class of f is script then
          f
      else
          script
              property |λ| : f
          end script
      end if
  end mReturn
  