Addition of element in a list of record (OCaml)

Question

I have a list of record :

list_clients = [{name = "c6"; number = 9}; {name = "c12"; number = 3}; {name = "c17"; number = 6};]

I would like to simply make the sum of all the "number" of each record.

What is the best way? I'm quite beginner with OCaml.

Answer 1

Use a fold:

List.fold_left (fun acc nxt -> nxt.number+acc) 0 list_clients

This takes every element in the list, grabs said element's 'number' field, and adds it to the total thus far, passing along the result.