Importing Functions

The easiest way to use a function from a module is simply use the module.function syntax.

Sometimes the name of the module might be long and used in several places. Let's say we were working on a web app using the nine library. We might be calling the json_response function a lot.

Our module might look like this:

fun handle_get_todos({'req: req} = c):
  todos = [{"id": 1, body": "Go to the store"},
           {"id": 2, body": "Wash the dishes"}]
  nine_cowboy_util.json_response(200, todos, req)

Perhaps this gets tiring after a while so we can simply import the function:

import nine_cowboy_util(json_response/3)

Then we can rewrite our handle_get_todos function like this:

fun handle_get_todos({'req: req} = c):
  todos = [{"id": 1, "body": "Go to the store"},
           {"id": 2, "body": "Wash the dishes"}]
  json_response(200, todos, req)

See how we didn't need to use the module prefix for the function call.