Async functions run asynchronously, consuming Promises and returning one too.

Just use $\ instead of *\. Generators are never async.

Await a promise using $. This allows you to write asynchronous code without higher-order functions.

These are based on a future JS feature.

import
	global fetch

$fetch-text = $\url
	response = $ fetch url
	$ response.text()

$fetch-text "./fetch-me.txt"

These are actually compiled to generators with a simple wrapper around them.

That's the awesome power of generators!

$for

$for is just like a for that runs all iterations together concurrently, rather than one-by-one.

It's concurrent, but not parallel unless you use web workers.

The value of the $for is a Promise for an Array of the results of each iteration.

It essentially compiles to Promise.all (@map @coll for-body). So, you must always provide a collection to iterate over, and break is forbidden.

import
	global fetch

$for ["./fetch-me.txt" "./fetch-me-too.txt"]
	$ ($ fetch_).text()

$for can appear as a statement inside $\.

In statement context, it is automatically awaited equivalent to $ $for ....

import
	global fetch

$fetch-map = $\urls
	with empty Map as map
		$for url of urls
			map[url] := $ ($ fetch url).text()

$fetch-map ["./fetch-me.txt" "./fetch-me-too.txt"]