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This tutorial is brought to you by ErlangCamp 2011 - Boston, August 12th and 13th - It’s gonna be totally sweet! It often occurs in coding that we need a library, a set of functionality. Often there are several algorithms that could provide this functionality. However, the code that uses it, either doesn’t care about the individual algorithm or wishes to delegate choosing that algorithm to some higher level. Lets take the concrete example of dictionaries. ...

In a build tool there is often a balancing act between ensuring repeatability and efficiency for the user. Wanting to make modifications on a dependency of your project is a common case of this. In rebar2 you could simply modify the source under deps/ and running rebar compile would pick those up. This meant that the contents of deps/ are not representative of the dependencies listed in rebar.config. With rebar3 a dependency is never rebuilt, even if a source file changes. ...

Why Cowboy and Batman.js There are a lot of Erlang web frameworks out there today. Not all are modeled after the MVC model (see Nitrogen), but I think all of them are addressing the problem the wrong way. I recently gave a presentation, slides here and the code for this example here, describing my perferred method for using Erlang for web development and why I think it is the best way to go. ...