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rabbitmq
erlando
Erlang2013–2024
rabbitmq / erlando · Archived

erlando

Erlando

4Distinct people
5Mentions
0Explicit recommenders
305GitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

Erlando

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year5 dated mentions

Observed mentions: 2013-01-24 09:13:53 UTC to 2024-11-11 16:10:57 UTC.

012013-01-01 00:00:00 UTC to 2014-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments20132014-01-01 00:00:00 UTC to 2015-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2015-01-01 00:00:00 UTC to 2016-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2016-01-01 00:00:00 UTC to 2017-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2017-01-01 00:00:00 UTC to 2018-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments2018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments20182019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2024

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20132013-01-01 00:00:00 UTC2014-01-01 00:00:00 UTC101
20142014-01-01 00:00:00 UTC2015-01-01 00:00:00 UTC101
20152015-01-01 00:00:00 UTC2016-01-01 00:00:00 UTC000
20162016-01-01 00:00:00 UTC2017-01-01 00:00:00 UTC000
20172017-01-01 00:00:00 UTC2018-01-01 00:00:00 UTC110
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC101
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC000
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC000
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC000
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC000
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC000
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC101

What Hacker News says

5 sources
For reference (for the "parse transform" approach in Erlang): https://github.com/rabbitmq/erlando - it doesn't look maintained, but it's probably still usable; otherwise, you might get some inspiration from the code :) This also (ab)uses list comprehension syntax: write_file(Path, Data, Modes) -> Modes1 = [binary, write | (Modes -- [binary, write])], do([error_m || Bin <- make_binary(Data), Hdl <- file:open(Path, Modes1), Result <- return(do([error_m || file:write(Hdl, Bin), file:sync(Hdl)])), file:close(Hdl), Result]). (if one of the calls returns `{error, Reason}` tuple, the execution terminates and the tuple is returned; otherwise, `{ok, Value}` tuple is unpacked)
In Show HN: Lyceum – An MMO game built with Zig and Erlang
Entirely subjective yes! ^.^ However what you show is not focusing on syntax differences but rather function differences, even `|>` is an (macro) operator. By syntax I'm talking about things like the `do`/`end` and `fn`/`end` and `,do:`/`do...end` mismatches, things like atom key short-form of `someatom: ...` (being short for `:someatom => ...`) only being useful at the end of it's list/map context instead of everywhere (which is not ambiguous nor have any other reason not to do it that I can see), having functions be callable with or without parenthesis (of which thankfully the formatter default puts parenthesis) when functions really should be defined with or without parenthesis and their usage enforced as such, mis-matches in the AST (when creating macro's) by special casing things like 2-tuples among others, and the really weird mul
Read the rest
ti-arity functions of `for` and `with` that really should have been done via body expressions instead of `,` separated expressions (and thus would not need to be special forms but could then just be normal macros, but they seem extremely out of place for the rest of the language syntax), etc.... etc... etc.. It's just a lot of little inconsistencies like that. Also, if you want pipes for erlang look at the https://github.com/rabbitmq/erlando parse transform (there are others as well, but I like this one), and if you want a shorter erlang form then look at erl2 (just a layer on top of erlang to shorten constructs like module definitions), and of course nothing beats `lfe` on the beam for succinctness and defineability (being a lisp after all). Also, your Elixir and Erlang codes do not do the same thing. Your Elixir code is being run at compile-time where your Erlang code is not executed at all, only compiled, and thus will only be run if something calls the `tok:start/0` function. The equivalent elixir would be (formatted by the Elixir formatter): ```elixir defmodule :tok do def start() do "Hello,How,Are,You,Today" |> String.split(",") |> Enum.join(".") |> IO.puts() end end ``` And you can leave off the final `:ok` on both as both `IO.puts/1` and `io:fwrite/2` both return the atom `ok` in the end. And even then these are not equal as you are working with charlists with one and binaries with the other, so a more direct translation of the Erlang code to Elixir would probably actually be: ```elixir defmodule :tok do def start() do 'Hello,How,Are,You,Today' |> :string.tokens(',') |> :string.join('.') |> (&:io.fwrite('~s~n', [&1])).() end end ``` That would make the functions equal. As an aside, a few other bits, Elixir defines if a function is public/private via `def`/`defp`, meaning you have to search through a file to see what is exposed, where in Erlang you can see exactly what is and everything that is exposed by just looking at the top. And yes, `do`/`end` may be longer by one line than Erlang's sequence operator `,` usage, but I don't mind it to be honest, and you can replicate it in Elixir anyway kind of like: ```elixir def start(), do: ( lst = :string.tokens('Hello,How,Are,You,Today', ','); :io.fwrite('~s~n', [:string.join(lst,',')]); :ok) ``` Essentially just replace erlang's `->` with `,do: (`, replace erlang's `,` with `;`, and finally replace erlang's `.` with `)`. Comparing 'function' differences between them is useless of course, they can call each other functions (though macro's are another issue, erlang cannot 'usefully' call elixir macro's, but then again elixir may not soon be able to use erlang's parse transforms either), the differences are the syntax, and Elixir just has a whole ton of oddities. Overall I find the Erlang syntax (which is similar to SML/OCaml/etc...) far more uniform, sensible, readable, and that it has far less surprising syntactical cases (like why can't I do something like `%{some_atom: 42, "string key" => 6.28}` in Elixir, blah... you have to do `%{"string key" => 6.28, some_atom: 42}` instead for who knows why reasons...). I do of course use Elixir for my day job, have for over 2 years now, and these are just a few constant things that bug me on a day-to-day basis. However the tooling, macro's, and community (come join us on the Elixir Forums!!!) are top-notch! If I had my 'choice' of mythical language though, I'd pick something like OCaml with Rust-style ownership semantics with a full staged macro system (Elixir's is a staged macro system) if it were not otherwise possible to safely add in a full Lisp-style macro system (I really don't think so in a full setup like these though, you need a staged system for various corner-case reasons).
In Elixir at PagerDuty
Just minor nitpick: "lisp style macros" are not necessarily hygienic either, which is why you need (gensym). Not in Scheme, though. "iirc you can just use one per module" I happen to use erlando[1] often (it's fun!) and I use both do and cut transforms all the time. So no, there is no limit to how many parse transforms you can use in one module. It's true, however, that writing them is a pain, which is why I never bothered to write one (just take a look at how the 'do' is implemented) - but I just accepted this as inevitable cost of not using s-exps as a language syntax. I'll take a look at how Elixir does it, I'd be very positively surprised if it manages to get real macros convenient in non-s-exp language :) [1] https://github.com/rabbitmq/erlando
In Towards a better Erlang - The Excitement of Elixir

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