🔀 Routing

Pattern Matching

Actually there is no built in router. But, you don't need routing library when you have Pattern Matching.

open Rex.Verb;
open Rex.Response;

let handler = Rex.HttpHandler.({verb, path, res}) => {
  switch (verb, path) {
  // GET "/"
  | (Get, []) => res |> send("Hello world!")
  // Get "/foo/bar"
  | (Get, ["foo", "bar"]) => res |> send("Hello FooBar!")
  // POST "/"
  | (Post, []) => res |> send("Posting!")
  // All Method "/secret"
  | (_, ["secret"]) => res |> send("Accessing secret...")
  // GET "/user/asuka" => "Username: asuka"
  // GET "/user/misato" => "Username: misato"
  | (Get, ["user", username]) => res |> send("Username: " ++ username)

  // Namespace (nested), all path begin with "/blog"
  | (_, ["blog", ...blogPath]) => {
    switch (verb, blogPath) {
    // GET "/blog" => "Blog home"
    | (Get, []) => res |> send("Blog home")
    // GET "/blog/article-1" => "article-1"
    // GET "/blog/article-2" => "article-2"
    | (Get, [article]) => res |> send(article)
    | _ => res |> Response.send("Not found")
    };
  }
  // other than that, respond with "Not found"
  | _ => res |> Response.send("Not found")
  };
};

Rex.App.make(~port=3000, ~handler, ());

Pattern match your way to glory!! 👑

Pattern Matching#

Pattern Matching