p_limit
similar to p-limit but for Deno.
Run multiple promise-returning & async functions with limited concurrency
Usage
import { pLimit } from "https://deno.land/x/p_limit@v1.0.0/mod.ts";
const limit = pLimit(1);
const input = [
limit(() => fetchSomething("foo")),
limit(() => fetchSomething("bar")),
limit(() => doSomething()),
];
(async () => {
// Only one promise is run at once
const result = await Promise.all(input);
console.log(result);
})();API
pLimit(concurrency)
Returns a limit function.
concurrency
Type: number
Minimum: 1
Default: Infinity
Concurrency limit.
limit(fn, …args)
Returns the promise returned by calling fn(...args).
fn
Type: Function
Promise-returning/async function.
args
Any arguments to pass through to fn.
Support for passing arguments on to the fn is provided in order to be able to
avoid creating unnecessary closures. You probably don’t need this optimization
unless you’re pushing a lot of functions.
limit.activeCount
The number of promises that are currently running.
limit.pendingCount
The number of promises that are waiting to run (i.e. their internal fn was not
called yet).
limit.clearQueue()
Discard pending promises that are waiting to run.
This might be useful if you want to teardown the queue at the end of your program’s lifecycle or discard any function calls referencing an intermediary state of your app.
Note: This does not cancel promises that are already running.