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rsvp

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rsvp

A lightweight library that provides tools for organizing asynchronous code

  • 4.8.5
  • latest
  • Source
  • npm
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Version published
Weekly downloads
5.8M
decreased by-40.27%
Maintainers
6
Weekly downloads
 
Created

What is rsvp?

The 'rsvp' npm package is a lightweight library for handling asynchronous operations in JavaScript. It provides a set of tools for working with Promises, which are a way to handle asynchronous operations more gracefully than traditional callback-based approaches.

What are rsvp's main functionalities?

Creating Promises

This feature allows you to create a new Promise. The Promise constructor takes a function with two arguments: resolve and reject. You can perform asynchronous operations inside this function and call resolve when the operation is successful or reject if it fails.

const RSVP = require('rsvp');

let promise = new RSVP.Promise(function(resolve, reject) {
  // Asynchronous operation
  setTimeout(function() {
    resolve('Success!');
  }, 1000);
});

promise.then(function(value) {
  console.log(value); // 'Success!'
});

Chaining Promises

This feature allows you to chain multiple Promises together. Each .then() method returns a new Promise, which can be used to perform further asynchronous operations.

const RSVP = require('rsvp');

let promise = new RSVP.Promise(function(resolve, reject) {
  setTimeout(function() {
    resolve(1);
  }, 1000);
});

promise.then(function(value) {
  return value * 2;
}).then(function(value) {
  console.log(value); // 2
});

Handling Multiple Promises

This feature allows you to handle multiple Promises concurrently. The RSVP.all() method takes an array of Promises and returns a new Promise that resolves when all of the input Promises have resolved.

const RSVP = require('rsvp');

let promise1 = new RSVP.Promise(function(resolve, reject) {
  setTimeout(function() {
    resolve('First');
  }, 1000);
});

let promise2 = new RSVP.Promise(function(resolve, reject) {
  setTimeout(function() {
    resolve('Second');
  }, 2000);
});

RSVP.all([promise1, promise2]).then(function(values) {
  console.log(values); // ['First', 'Second']
});

Handling Promise Rejection

This feature allows you to handle errors in Promises. The .catch() method is used to specify a callback function that will be called if the Promise is rejected.

const RSVP = require('rsvp');

let promise = new RSVP.Promise(function(resolve, reject) {
  setTimeout(function() {
    reject('Error!');
  }, 1000);
});

promise.then(function(value) {
  console.log(value);
}).catch(function(error) {
  console.error(error); // 'Error!'
});

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Package last updated on 06 Jun 2019

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