Pipe Operator

Pipe Operator

The |> operator passes a value as the last argument to a function. It lets you write left-to-right data pipelines:

let result =
    [1; 2; 3; 4; 5]
    |> List.filter (fun x -> x % 2 = 0)
    |> List.map (fun x -> x * x)
    |> List.sum
printfn $"{result}"  // 20  (4 + 16)

This reads top-to-bottom: start with the list, keep evens, square each, sum all.

Without pipes, the same code would be deeply nested:

let result = List.sum (List.map (fun x -> x * x) (List.filter (fun x -> x % 2 = 0) [1;2;3;4;5]))

Your Task

Write a pipeline that takes the list [1; 2; 3; 4; 5; 6; 7; 8; 9; 10], keeps only numbers divisible by 3, doubles each, and sums the result. Print the answer.