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Fabian Vogelsteller frozeman

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MaiaVictor /
Last active Jul 26, 2021
async/await is just the do-notation of the Promise monad

async/await is just the do-notation of the Promise monad

CertSimple just wrote a blog post arguing ES2017's async/await was the best thing to happen with JavaScript. I wholeheartedly agree.

In short, one of the (few?) good things about JavaScript used to be how well it handled asynchronous requests. This was mostly thanks to its Scheme-inherited implementation of functions and closures. That, though, was also one of its worst faults, because it led to the "callback hell", an seemingly unavoidable pattern that made highly asynchronous JS code almost unreadable. Many solutions attempted to solve that, but most failed. Promises almost did it, but failed too. Finally, async/await is here and, combined with Promises, it solves the problem for good. On this post, I'll explain why that is the case and trace a link between promises, async/await, the do-notation and monads.

First, let's illustrate the 3 styles by implementing

bas-vk / chat.js
Last active Mar 21, 2018
whisper chat demo
View chat.js
var chat = {
username: "<not set>",
topic: "0xfeedbabe",
key: "",
identity: "",
pollInterval: null,
filter: null,
setUsername: function(name) {
this.username = name;
bas-vk / ercevocer.js
Last active Aug 4, 2021
Use solidity ecrecover with signature calculated with eth_sign
View ercevocer.js
// Change accountToSignWith to the address of your account.
var Web3 = require('web3');
var web3 = new Web3();
web3.setProvider(new web3.providers.HttpProvider('http://localhost:8545'));
var accountToSignWith = '0xbedcf417ff2752d996d2ade98b97a6f0bef4beb9';
var message = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Tubulum fuisse, qua illum, cuius is condemnatus est rogatione, P. Eaedem res maneant alio modo.'
View upgradeable.sol
* Base contract that all upgradeable contracts should use.
* Contracts implementing this interface are all called using delegatecall from
* a dispatcher. As a result, the _sizes and _dest variables are shared with the
* dispatcher contract, which allows the called contract to update these at will.
* _sizes is a map of function signatures to return value sizes. Due to EVM
* limitations, these need to be populated by the target contract, so the
* dispatcher knows how many bytes of data to return from called functions.
kTmnh / ios6-timers.js
Last active Dec 12, 2019 — forked from ronkorving/ios6-timers.js
iOS6 webkit timer bug workaround
View ios6-timers.js
(function (window) {
// This library re-implements setTimeout, setInterval, clearTimeout, clearInterval for iOS6.
// iOS6 suffers from a bug that kills timers that are created while a page is scrolling.
// This library fixes that problem by recreating timers after scrolling finishes (with interval correction).
// This code is free to use by anyone (MIT, blabla).
// Original Author:
var timeouts = {};
var intervals = {};
var orgSetTimeout = window.setTimeout;
var orgSetInterval = window.setInterval;
molily /
Last active Oct 7, 2015
Slides of the meetups

The meetup is a Berlin.js spin-off with a special focus on JavaScript-driven web applications (“HTML5 apps”), desktop browser apps as well as mobile apps and games written in JavaScript. Here you can find the slides and additional links of all past talks. Please fork this Gist to add more info!

First meetup on May 10th 2012

davidwkeith / localization_helper.js
Created Jul 11, 2012
Localization Helper for Ember.js's Handlebars
View localization_helper.js
Handlebars.registerHelper('loc', function(property, fn) {
var str;
// we are bound to a value, it is now the context
if (fn.contexts && typeof fn.contexts[0] === 'string') {
str = fn.contexts[0];
// Convention, start all localization keys with _
} else if (property[0] === '_') {
str = property;
kurtmilam / deep_extend_javascript_objects_underscore_mixin.js
Last active Oct 3, 2020
Deep Extend / Merge Javascript Objects - underscore.js Mixin
View deep_extend_javascript_objects_underscore_mixin.js
/* Copyright (C) 2012-2014 Kurt Milam - | Source:
* This mixin now has its own github repository:
* It's also available through npm and bower
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.