The pend npm package is designed to manage and limit the concurrency of asynchronous operations in Node.js applications. It provides a simple API to queue tasks and control how many of them are executed in parallel, making it easier to manage resources and improve the performance of applications that perform a lot of asynchronous operations, such as file I/O or network requests.

What are pend's main functionalities?

Limiting concurrency of asynchronous operations

This code sample demonstrates how to use pend to limit the concurrency of asynchronous operations. It creates a new Pend instance, sets a concurrency limit, and then queues several asynchronous operations. Pend ensures that only a specified number of operations run in parallel, and provides a callback for when all operations are completed.

const Pend = require('pend');

const pend = new Pend();
pend.max = 2; // Limit to 2 concurrent operations

function asyncOperation(callback) {
  setTimeout(() => {
    console.log('Operation completed');
    callback();
  }, 1000);
}

for (let i = 0; i < 5; i++) {
  pend.go((cb) => {
    asyncOperation(cb);
  });
}

pend.wait(() => {
  console.log('All operations completed');
});

Other packages similar to pend

Readme

Source

Pend

Dead-simple optimistic async helper.

Usage

var Pend = require('pend');
var pend = new Pend();
pend.max = 10; // defaults to Infinity
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.

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Last updated on 05 Jul 2014

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