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Peter Leonov peter-leonov

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@ValeriiVasin
ValeriiVasin / 00-condition.js
Last active January 21, 2019 18:28
parallel async iteration via generator
(async function() {
async function f1() {
return new Promise(res => {
setTimeout(() => {
res('1.1');
}, 1000);
});
}
async function f2() {
@agentcooper
agentcooper / run-parallel.html
Created January 21, 2019 14:30
<html>
<head>
<title>Run parallel</title>
</head>
<body>
<script>
(async function() {
async function f1() {
return new Promise(res => {
setTimeout(() => {
@miyaokamarina
miyaokamarina / conditions.js
Last active March 9, 2023 15:31
Type-level conditions in Flow https://is.gd/OPsJBd
// Licensed under CC BY 4.0.
type $If<X: boolean, Then, Else = empty> = $Call<
& ((true, Then, Else) => Then)
& ((false, Then, Else) => Else),
X,
Then,
Else,
>;
@VictorTaelin
VictorTaelin / promise_monad.md
Last active March 23, 2024 17:49
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

@gvergnaud
gvergnaud / lazy-list.js
Last active July 31, 2023 23:57
Lazy List, implemented with es6 generators
/* ----------------------------------------- *
Lazy List Implementation
* ----------------------------------------- */
// Haskell-like infinite List, implemented with es6 generators
// Lazyness lets you do crazy stuff like
List.range(0, Infinity)
.drop(1000)
.map(n => -n)
@rroblak
rroblak / README.md
Last active October 26, 2023 03:22
git diff image files on the command line, with color

This is a simple way to spot check that the modified image in your git index is the image you actually want without having to leave the command line.

Example: http://i.imgur.com/RUenUcM.png

Instructions

  1. Install git, ImageMagick, and jp2a via your favorite package manager.
  2. Put img-ascii-diff somewhere (e.g. ~/bin/img-ascii-diff).
  3. Put attributes in ~/.config/git/attributes.
  4. Modify ~/.gitconfig and add the lines below, pointing to wherever you put img-ascii-diff.
@joost
joost / ruby_google_analytics_server_to_server.md
Last active November 27, 2023 15:43
Google Analytics API (server-to-server) using Ruby
@dergachev
dergachev / GIF-Screencast-OSX.md
Last active April 19, 2024 11:00
OS X Screencast to animated GIF

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Screencapture GIF

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

@kitek
kitek / gist:1579117
Created January 8, 2012 17:50
NodeJS create md5 hash from string
var data = "do shash'owania";
var crypto = require('crypto');
crypto.createHash('md5').update(data).digest("hex");