kew

What is kew?

The 'kew' npm package is a lightweight promise library for Node.js that provides a simple and efficient way to handle asynchronous operations. It is designed to be fast and easy to use, offering a minimalistic API for creating and managing promises.

What are kew's main functionalities?

Creating Promises

This feature allows you to create promises using the 'kew' library. The example demonstrates how to create a deferred object, resolve it after a timeout, and handle the resolved value using the 'then' method.

const Q = require('kew');

function asyncTask() {
  const defer = Q.defer();
  setTimeout(() => {
    defer.resolve('Task completed');
  }, 1000);
  return defer.promise;
}

asyncTask().then(result => {
  console.log(result); // 'Task completed'
});

Chaining Promises

This feature allows you to chain multiple promises together. The example demonstrates how to chain two asynchronous tasks, where the second task starts only after the first task is completed.

const Q = require('kew');

function firstTask() {
  const defer = Q.defer();
  setTimeout(() => {
    defer.resolve('First task completed');
  }, 1000);
  return defer.promise;
}

function secondTask() {
  const defer = Q.defer();
  setTimeout(() => {
    defer.resolve('Second task completed');
  }, 1000);
  return defer.promise;
}

firstTask()
  .then(result => {
    console.log(result); // 'First task completed'
    return secondTask();
  })
  .then(result => {
    console.log(result); // 'Second task completed'
  });

Handling Errors

This feature allows you to handle errors in asynchronous operations. The example demonstrates how to create a promise that rejects with an error and how to handle the error using the 'fail' method.

const Q = require('kew');

function asyncTaskWithError() {
  const defer = Q.defer();
  setTimeout(() => {
    defer.reject(new Error('Something went wrong'));
  }, 1000);
  return defer.promise;
}

asyncTaskWithError()
  .then(result => {
    console.log(result);
  })
  .fail(error => {
    console.error(error.message); // 'Something went wrong'
  });

Other packages similar to kew

bluebird

Bluebird is a fully-featured promise library for JavaScript. It is known for its performance and extensive API, which includes utilities for working with collections, cancellation, and more. Compared to 'kew', Bluebird offers a richer set of features and is widely used in the JavaScript community.

q

Q is another promise library for JavaScript that inspired many other promise libraries, including 'kew'. It provides a similar API for creating and managing promises but includes additional features like progress notifications and more comprehensive error handling. Q is more feature-rich compared to 'kew'.

es6-promise

ES6-Promise is a polyfill for the ES6 Promises specification. It provides a minimalistic implementation of promises that adheres to the ES6 standard. While 'kew' offers a more lightweight and efficient solution, ES6-Promise is useful for ensuring compatibility with the ES6 standard.

README

kew.