CODEWITHSUNDEEP
ocaml
user3047960
user3047960

Reputation: 161

Iterate over a list while tracking index?

I was just wondering if there was a way to iterate over a list while also keeping track of its index in OCaml? That would be really useful - I'm trying to stagger each element of a list by its index value. Thanks.

Upvotes: 1

Views: 1995

Answers (1)

Jeffrey Scofield
Jeffrey Scofield

Reputation: 66803

There is a function List.iteri that iterates over a list while supplying the index of each element. But if you want to generate a new list, it might be more appropriate to use List.mapi, which supplies the index of each element and builds up a new list (of the same size).

# List.mapi (fun index element -> element + index) [0;1;2;3];;
- : int list = [0; 2; 4; 6]

Documentation on OCaml List iterator functions.

Upvotes: 4

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