F# sum two sequences by element

Question

I am looking for a way to sum two sequences by element in F#.

For example, if I have these two sequences:

let first = seq [ 183.24; 170.15;174.17]
let second = seq [25.524;24.069;24.5]

I want to get the following result:

third list = [208.764;194.219;198.67]

What would be the simplest or the best way to achieve this?

Answer 1

You can use the zip function :

let third = Seq.zip first second |> Seq.map (fun (x, y) -> x + y)

It will create a new sequence with a tuple where the first element is from first and second form second, then you can map and apply the addition of both elements.

As pointed in the comments, map2 is another option, we could say that map2 is equivalent to zip followed by map.