The Hamler Programming Language


Haskell-style functional programming language running on Erlang VM.

View the Project on GitHub hamler-lang/hamler

The Hamler Programming Language

Hamler is a strongly-typed language with compile-time typechecking and built-in support for concurrency and distribution.

Hamler empowers industries to build the next generation of scalable, reliable, realtime applications, especially for 5G, IoT and edge computing.

Why Hamler?

For almost a decade, we have been developing software systems based on Erlang/OTP, especially our main product EMQ X - the scalable open-source MQTT broker. So, we have always believed that Erlang is a masterpiece of engineering. With amazing concurrency, distribution and fault tolerance, it is one of the few general-purpose language platforms able to properly handle concurrency and soft realtime.

However, from all the experience writing Erlang, we believe that the following features can help Erlang programmer better adapt to the coming wave of 5G, IoT and edge-programming and attract more people for using BEAM.

Now all the features are avaliable in the Hamler programming language.



The Hamler compiler architecture is shown as below:


The Hamler 0.1 compiler was forked from PureScript 0.13.6. The Hamler source code is parsed to generate CST, then CoreErlang’s IR is generated after CST -> AST -> CoreFn’s syntax tree transformation, syntax analysis and type checking. The code is then used by the Erlang compiler to generate the final Beam bytecode.


Get installation packages from Github Release

Note: packages for windows will be coming soon…


$ tar zxvf hamler-$version.tgz -C /usr/lib/hamler
$ ln -s /usr/lib/hamler/bin/hamer /usr/bin/hamler

Centos 7

$ rpm -ivh hamler-$version-1.el7.x86_64.rpm

Debian 8 / Debian 9 / Debian 10 / Ubuntu 16.04 / Ubuntu 18.04 / Ubuntu 20.04

$ dpkg -i hamler_$version_amd64.deb


brew tap hamler-lang/hamler
brew install hamler

Build from source code(macOS)

  1. Install Erlang

    brew install erlang@23
  2. Install Stack

    brew install haskell-stack
  3. Clone hamler from the git repo

    git clone
  4. Install hamler

    cd hamler
    make install

Create a project

  mkdir demo-project
  cd demo-project
  hamler init
  make run

Try the interpreter

  hamler repl

  > -- List, range and enums
  > [1,2,3]
  > [1..10]
  > ['a'..'z']

  > -- erlang style maps
  > import Data.Map as Map
  > -- New map
  > m = #{"foo" => "bar", "bar" => "foo"}
  > -- Match Map
  > #{"foo" := a, "bar" := b} = m
  > -- get, put
  > Map.get "foo" m -- a = "bar"
  > Map.get "bar" m -- b = "foo"
  > m1 = Map.put "key" "val"
  > -- keys, values
  > keys = Map.keys m
  > values = Map.values m


Community, discussion and supports

You can reach the Hamler community and core team via the following channels:


To contribute to Hamler project:

Core Team

The Hamler core team comes from EMQ Technologies Co., Ltd. now:

License & Credits

We would like to express our great appreciation to the PureScript team and community for all years of efforts making its amazing compiler, especially CoreFn and its incredible adaptability.

The hamler language project is licensed under BSD3, see LICENSE.

About EMQ

EMQ is an open-source software company providing highly-scalable, real-time messaging and streaming platform for IoT applications in 5G Era.