How can I encapsulate the idea of 'all parameters' in F#?

Question

In F#, I need to do something like this:

let price k s t r v =
  let d1 = d1 k s t r v
... and so on

I'm getting really tired of listing all the parameters when they are passed into a function. Apart from turning the parameters into a parameter object (something I cannot do), is there any way to group the parameters? I'm thinking of something like

let price (k s t r v as foo) =
  let d1 = d1 foo

Any ideas? Thanks.

Answer 1

You can effectively batch together your arguments (call them w, x, y, z ) via a higher-order function like so

let batchedArgs f = f w x y z

Now batchedArgs is a closure over the original function arguments. You just pass it another function which takes the same number/type of arguments, and they will be applied.

// other functions which you wish to pass the args to
let sub1 w x y z = 42
let sub2 w x y z = true

// main routine
let doStuff w x y z =
    // one-time declaration of batching function is
    // the only time you need to list out the arguments
    let batchedArgs f = f w x y z

    // from then on, invoke like this
    batchedArgs sub1
    // or like this, which looks more like a traditional function call
    sub2 |> batchedArgs