Federico Caprari korsmakolnikov

Functional Composition with Multiple Parameters in Haskell

In the past, I've written composition functions in both Elm and Haskell that take multiple parameters for the leftmost function, i.e. the function that gets applied first.

(All examples here are in Haskell)

Here was my Haskell implemenation (stolen from the web):

compose2 :: (c -&gt; d) -&gt; (a -&gt; b -&gt; c) -&gt; a -&gt; b -&gt; d

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

The Pervert's Guide to Computer Programming Languages - SXSW

What is the right programming language for you? Traditionally programming languages are created to concisely model a specific problem, or to maximize expression while solving a broad range of problems. Psychoanalysts have noted that many decisions we make as humans are not based on rational premises

Functional programming design patterns by Scott Wlaschin

In object-oriented development, we are all familiar with design patterns such as the Strategy pattern and Decorator pattern, and design principles such as SOLID. The functional programming community has design patterns and principles as well. This talk will provide an overview of some of these, and

Docker (Mac) De-facto Standard Host Address Alias

This launchd script will ensure that your Docker environment on your Mac will have 10.254.254.254 as an alias on your loopback device (127.0.0.1). The command being run is ifconfig lo0 alias 10.254.254.254.

Once your machine has a well known IP address, your PHP container will then be able to connect to it, specifically XDebug can connect to it at the configured xdebug.remote_host.

Installation Of IP Alias (This survives reboot)

Copy/Paste the following in terminal with sudo (must be root as the target directory is owned by root)...

Basic RESTful API with Symfony 3 + FOSRestBundle (JSON format only) + FOSUserBundle + FOSOauthServerBundle

The API we are creating in this gist will follow these rules :

The API only returns JSON responses
All API routes require authenticationu
Authentication is handled via OAuth2 with password Grant Type only (no need for Authorization pages and such).
API versioning is managed via a subdomain (e.g. v1.api.example.com)

The API will be written in PHP with the Symfony 3 framework. The following SF2 bundles are used :

Note: these instructions are for pre-Sierra MacOS. Sierra (10.12) and newer users see https://gist.github.com/gravitylow/fb595186ce6068537a6e9da6d8b5b96d by @gravitylow

If you are getting this in gdb on OSX while trying to run a program:

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

This is the process of setting up erlang, rebar3, and cowboy for a Hello World, starting with a clean Debian 8 install.

Update apt and install deps:

root@046edcaea45a:~# apt-get update
root@046edcaea45a:~# apt-get install erlang erlang-dev gcc
root@046edcaea45a:~# wget https://s3.amazonaws.com/rebar3/rebar3
root@046edcaea45a:~# mkdir ~/bin/
root@046edcaea45a:~# mv rebar3 ~/bin/
root@046edcaea45a:~# chmod +x ~/bin/rebar3

	server {
	listen 80;
	server_name localhost;
	root /Users/YOUR_USERNAME/Sites;

	access_log /Library/Logs/default.access.log main;

	location / {
	include /usr/local/etc/nginx/conf.d/php-fpm;
	}

	<?php

	namespace App\UserBundle\Controller;

	use Doctrine\ORM\EntityManager;
	use Symfony\Bundle\FrameworkBundle\Controller\Controller;
	use Symfony\Component\HttpFoundation\JsonResponse;
	use Symfony\Component\HttpFoundation\Request;

	/**