Yes, that was what I was never quite clear on. What is your *actual problem, in context*, not the problem you think you have because you read elsewhere that foldl' is more efficient?

On 08/14/2018 11:22 AM, Damian Nadales wrote:

Ok, so if understood the bottom line of the answers I got from
Vanessa and Hiromi the take away seems to be: if you're prototyping
then stick to the lazy version of sum, otherwise use more advanced
data structures (Vectors or Folds).

Are you implying that lazy functions are only good for prototyping? Or
is there something wrong with sum in particular?

More generally, why isn't sum working for you?

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