Operators

Suave keeps a small set of operators. Prefer readability over cryptic symbol soup.

Operator	Meaning
`>=>`	Left-to-right Kleisli composition of WebParts (run left, then right if Some).
`<\|>`	Try left; if it fails (None), try right. Useful as a binary alternative to short `choose` lists.
`?`	Look up a key in a dictionary-like structure (`open Suave.Utils.Collections`).
`%%`	Search a list of key/value pairs; return the value or None.
`^^`	Search a list of key/optional-value pairs; return the value or None.
`?<-`	Assign a value for a key in a dictionary.

Example

open Suave
open Suave.Filters
open Suave.Operators
open Suave.Successful
open Suave.Utils.Collections

let greetings q =
  defaultArg (Suave.Utils.Option.ofChoice (q ^^ "name")) "World"
  |> sprintf "Hello %s"

let app =
  path "/hello" >=> choose [
    GET  >=> request (fun r -> OK (greetings r.query))
    POST >=> request (fun r -> OK (greetings r.form))
  ]

Full signatures: API reference.