Constructors as first-class function values

constructors.fs

// old approach
let makeStrings chars lens =
    List.zip chars lens
    |> List.map (fun (char, len) -> new System.String(char, len))

// new approach
let makeStrings' chars lens =
    List.zip chars lens
    |> List.map System.String // use ctor as function

makeStrings' ['a';'b';'c'] [1;2;3] // ["a"; "bb"; "ccc"]