The F# structure is a data structure which is used to organize data, and it is value types and efficient than class. It does not allow let binding, so you must declare fields by using val keyword.
Example :
type Book = struct
val title : string
val author: string
val price : float
new (title, author, price) = // Constructor
{title = title; author = author; price = price;}
end
let book = new Book("FSharp Programming", "Chris Smith", 100.0) // Calling Constructor
printfn "Title : %s " book.title
printfn "Author : %s" book.author
printfn "Price : $%0.2f" book.price
