Talk:Reduction operator

What's the difference between this and Fold (higher-order function)?
If nothing else, the articles should refer to each other with explanations to prevent confusion. Notrium (talk) 18:33, 15 June 2020 (UTC)

Apply the reduction operator before elements are reduced
> The reduction of sets of elements is an integral part of programming models such as Map Reduce, where a reduction operator is applied (mapped) to all elements before they are reduced.

Really? We apply the reduction operator before the elements are reduced? Don't we apply a map operator first (whatever the term is) and the reduce operator next? 89.247.23.188 (talk) 15:22, 7 October 2022 (UTC)