pend

Pend

Dead-simple optimistic async helper.

Usage

var Pend = require('pend');
var pend = new Pend();
pend.max = 10; // defaults to Infinity
setTimeout(pend.hold(), 1000); // pend.wait will have to wait for this hold to finish
pend.go(function(cb) {
  console.log("this function is immediately executed");
  setTimeout(function() {
    console.log("calling cb 1");
    cb();
  }, 500);
});
pend.go(function(cb) {
  console.log("this function is also immediately executed");
  setTimeout(function() {
    console.log("calling cb 2");
    cb();
  }, 1000);
});
pend.wait(function(err) {
  console.log("this is excuted when the first 2 have returned.");
  console.log("err is a possible error in the standard callback style.");
});

Output:

this function is immediately executed
this function is also immediately executed
calling cb 1
calling cb 2
this is excuted when the first 2 have returned.
err is a possible error in the standard callback style.

Similar packages

Other packages similar to pend

async

The async package is a comprehensive collection of utility functions for working with asynchronous JavaScript. It includes features for controlling the flow of asynchronous operations, such as limiting concurrency, similar to pend. However, async offers a broader range of functionalities beyond concurrency control, making it more versatile but also more complex.

p-limit

p-limit is a lightweight package specifically designed to limit the concurrency of promise-returning & async functions. It is very similar to pend in its purpose but works with Promises instead of callbacks, making it more suitable for modern asynchronous patterns in JavaScript.