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lie

A basic but performant promise implementation

    3.3.0latest
    GitHub
    npm

Version published
Maintainers
1
Weekly downloads
9,725,517
increased by4.39%

Weekly downloads

Package description

What is lie?

The 'lie' npm package is a lightweight, performant promise library implementing the Promises/A+ specification. It provides a simple way to work with asynchronous operations in JavaScript, allowing developers to create, manage, and compose promises for better asynchronous flow control.

What are lie's main functionalities?

Creating a new promise

This feature allows you to create a new promise. The constructor takes a function that contains the asynchronous operation. The function provides two arguments, resolve and reject, which are used to settle the promise.

var Promise = require('lie');
var myPromise = new Promise(function (resolve, reject) {
  // Asynchronous operation here
  if (/* operation successful */) {
    resolve('Success!');
  } else {
    reject('Failure!');
  }
});

Promise resolution

This feature is used to create a promise that is immediately resolved with a given value. It's useful for converting values to promises.

var Promise = require('lie');
Promise.resolve('Immediate resolve').then(function (value) {
  console.log(value); // 'Immediate resolve'
});

Promise rejection

This feature is used to create a promise that is immediately rejected with a given reason. It's useful for representing asynchronous operations that have failed.

var Promise = require('lie');
Promise.reject(new Error('Immediate reject')).catch(function (error) {
  console.error(error); // Error: 'Immediate reject'
});

Chaining promises

This feature allows you to chain multiple promises together and perform actions once all of them are settled. The Promise.all method returns a single promise that resolves when all of the promises in the iterable argument have resolved.

var Promise = require('lie');
var p1 = Promise.resolve(3);
var p2 = 1337;
var p3 = new Promise(function (resolve, reject) {
  setTimeout(resolve, 100, 'foo');
});

Promise.all([p1, p2, p3]).then(function (values) {
  console.log(values); // [3, 1337, 'foo']
});

Other packages similar to lie

Readme

Source

lie

Promises/A+ logo [![Build Status](https://travis-ci.org/calvinmetcalf/lie.svg)](https://travis-ci.org/calvinmetcalf/lie)

lie is a small, performant promise library implementing the Promises/A+ spec (Version 1.1).

Originally a fork of Ruben Verborgh's promiscuous, with version 2.6 it became a fork of ayepromise by Chris Burgmer.

npm install lie

var Promise = require('lie');
// or use the pollyfill
require('lie/polyfill');

Usage

Either use it with browserify (recommended) or grab one of the files from the dist folder:

  • lie.js/lie.min.js exposes 'Promise' either as a UMD module or from the global scope, depending on if a CJS or AMD loader is available.
  • lie.polyfill.js/lie.polyfill.min.js adds 'Promise' to the global scope only if it's not already defined (not a UMD).

API

Implements the standard ES6 api:

new Promise(function(resolve, reject){
    doSomething(function(err, result) {
        if (err) {
            reject(err);
        } else {
            resolve(result);
        }
    });
}).then(function (value) {
    //on success
}, function (reason) {
    //on error
}).catch(function (reason) {
    //shortcut for error handling
});

Promise.all([
    //array of promises or values
]).then(function ([/* array of results */]));

Promise.race([
    //array of promises or values
]);
// either resolves or rejects depending on the first value to do so

Unhandled Rejections

In Node.js, lie emits an unhandledRejection event when a rejected promise isn't caught, in line with how io.js does it. This allows it to act as a promise shim in both Node.js and the browser.

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Last updated on 06 Mar 2018

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