Erlang

Introduction

This post implies a good intro into N2O.

In order to learn about Erlang/OTP Web Framework N2O main features you should visit the github page or the official SynRC website. You will find there all the charts and presentations which you like so much.

In this article I will cover the principles of framework operation.
Version under consideration: N2O: 1.1.0.

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Who This Article Is For

I would say that the article is mainly for people who already have an experience with some other programming languages, but they want to look around. Also, functional programming is a trending thing nowadays. So if you want to see what it actually is, welcome. If you are a complete beginner, it's still may be useful, as it's always good to know what's going on around the world of IT.

A Few Words about Elixir

A few years ago Jose Valim posted in his repository a project of the language that is built on top of Erlang VM — Elixir. In the article you’ll find extracts from the documentation and a few simple examples.

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Dear %username%,

It’s the first article of the series. For many of you it may seem terribly trite as I’ll review the very basis of the subject. But this tutorial is going to be really useful for Erlang beginners. I’ll also dwell on some interesting things that aren’t obvious.

In order to begin your work with Erlang, execute the following in the terminal:

$ sudo apt-get install erlang
$ erl

That will start the Erlang interpreter. You should carry out examples from the article in it. In Erlang, in contrast to most languages, we put a period at the end of expression. Comments begin with % symbol and go on till the end of the line.

So, let’s start.

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Dear %username%,

Let’s continue to learn Erlang.

In the previous post we’ve reviewed the basic data types, lists and tuples. We also learnt how to use pattern matching and lists generator.
In this post we’ll move on to the next level and review modules and functions.

All functions in Erlang are defined in modules. Standard functions of the language, which we invoke as “global” (for instance, length, hd, tl), are actually inside of the module as well. They are BIFs (Built-In Functions) and belong to erlang module. This module is imported by default. Therefore, we can work with them like with regular functions (I’ll tell you more about the module importing below).

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This article is about a WebSocket server on Erlang rather than about the game itself. I’ll tell you a small prehistory. When I began playing 2048 I couldn’t stop. It was to the detriment of both my job and family. So I decided that a bot should play instead of me. But the problem was that it’s a user game, there’s no global rating and it’s not comfortable to play without a browser. That’s why I decided to create the server part so that there would be rating and my bot could play without a browser.

It’s my first project in Erlang. Many programmers are afraid of it. They suppose that it’s difficult to use it. But it’s actually not. I’ll try to highlight some things that are not obvious for Erlang beginners.

I’ve hard coded a lot of things for simplicity. But anyway, I’ll be glad to read your comments on the subject.

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Erlang — is a general-purpose concurrent, garbage-collected programming language and runtime system.

The release has a lot of new different features and changes. The first thing is that the versioning scheme has been changed. Previously it was R15B, R16B, etc.

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