How would this snippet be rewritten using F#?

Question

I'm learning F#, and I'd like to know how a snippet like this could be written using F# only:

2.times {
  puts "hello"
}

If you can explain how/if functions that take blocks are possible in F#, that would be great as well.

Answer 1

The times function can be written as :

let times act n =
    for i in 1 .. n do
        act()

and can be invoked as :

2 |> times (fun () -> printfn "Hello")    

Answer 2

Here's one that uses a lambda (basically a ruby block):

{1..2} |> Seq.iter (fun _ -> printfn "hello")

Here the Seq.iter function is taking a lambda as parameter, which is executed in each iteration.

Answer 3

I don't have a compiler handy, so someone please fix this up if it doesn't compile. Here's a way to define the corresponding F# extension member.

type System.Int32 with
    member this.Times(act) =
        for i in 1..this do
            act()

(2).Times (fun() -> printfn "Hello")