[jpittis]

Is Elixir really the general purpose productivity tool that comments here (and on other HN posts) make it out to be?

I've loved playing with Erlang and Elixir. The concurrency model and approach to failure are fascinating and clearly powerful for certain problems. Elixir's Pheonix feels as productive as Rails. I've read most of Joe Armstrong's books and watched most of his talks.

However, I feel like I can throw my daily driver programming languages including Go, Ruby, Rust... even Haskell at any problem and give or take performance, come out the other end with high quality software at scale.

When I last wrote Elixir, it felt great when I was doing basic Rails shaped work or lower level concurrency heavy networking (I was playing with TUN/TAP interfaces), but I really can't imagine it as a general purpose programming language.

For example I can't imagine scripting in Elixir, but I can and do in the other languages mentioned above. Also I remember trying to write a parser library and it felt way more verbose and unmaintainable than the equivalent Haskell or Rust.

This is hand wavy, but does anyone feel what I'm getting at? Any thoughts?

[bcrosby95]

I don't think Elixir aims to be a general purpose scripting language. I only use it for hobby stuff, but lately I've been writing my scripts in a few languages to compare their characteristics: performance, lines of code, and delta code change when making a single threaded script into multi threaded.

I find that Elixir code for these tasks tends to be a bit longer than standard scripting languages, a bit shorter than Go/Java, with performance around Go and slightly better than Java. One of the interesting things I find though is that with the Flow library, bringing it from single to multiple threads tends to require fewer changes - generally I just have to change some uses of Stream to Flow and I'm up and running with a solution that's using all my cores.

[elcritch]

That'd be about my assessment as well, though it's been a while since I programmed Java/C++ etc. I ported Vault's Shamir secret algorithm from Go to Elixir, and it was about 25% less lines of code. Though Python scripts tend to be shorter for small projects, bigger ones get more verbose when dealing with classes and data sharing, IMHO. Python scripting is also more prone to difficult debugging issues due to immutability and inconsistent/dated libraries. For example, a Python SPI library I tried for an IoT sensor deleted all of the items from the list of SPI bytes given to it... which took an hour to figure out as that was completely unexpected and I kept thinking my part was bad (though perhaps I'm too used to Elixir's immutability now).

[freedomben]

For others not familiar with "Flow" I'm guessing it is this (which looks awesome): https://hexdocs.pm/flow/Flow.html

[AlchemistCamp]

> However, I feel like I can throw my daily driver programming languages including Go, Ruby, Rust... even Haskell at any problem and give or take performance, come out the other end with high quality software at scale.

You're probably right. With a very high-level language like Ruby and an extremely efficient systems language like Rust, you've pretty much got the entire spectrum covered. With libraries like Helix, you've even got an escape hatch if you start with Rails and hit unexpected bottlenecks.

IMO Elixir is nearly ideal for web startups due to productivity, enough performance, easy scaling and a very gentle learning curve. If you've already got all those other tools under your belt, then those pluses are probably less of a draw.

[slindz]

Elixir has been my daily driver for four years, I came from a brief stint in Ruby.

It's true that most problems are largely manageable by most/all languages.

What I've come to appreciate is how often Elixir has made me a better programmer with its conventions.

Their choices have steered me away from a lot of foot guns and forced me to learn better ways to do things.

[triplejjj]

It really depends on what you mean by general purpose.

At work we use Elixir for web and data ingestion, and I could have used Ruby for web but Ruby is considerably behind for data stuff.

Elixir is fine for one-off scripts, Ruby and Python may be a bit more convenient, but overall they are all too heavy to distribute compared to languages like Go and Rust.

Elixir is also used for high-end embedded and there is the whole distributed programming bits, which is quite specific to its platform, and more complicated to setup in almost all other places.

So overall it does provide some nice coverage across a couple areas although it lacks on other ones (GUIs, ML, etc).

[dnautics]

I've written scripts in elixir that did performance testing of parallel downloads over cloud storage services. Also I have a script that I run once a year year to scrape Google maps for driving mileage.

The deployment story for elixir scripts sucks because it is less portable than say ruby or python (the person running the script needs to have elixir and you can't really use library deps in a sane way), but I don't mind it, because it's totally worth having less hassle for the cases where you want a well-defined deployment.

At work, I am using elixir to: orchestrate VMs (this is more traditional elixir-ish), but definitely not really a website or embedded, as a PXE boot provisioning system for metal systems, as a substitute for ansible for laying out software on systems, which are more script-ish, but on the side of "scripts for which you are really going to want to have a consistent deployment story".

[ch4s3]

I'd be curious to hear about your experience writing a parser vs Rust. NimbleParsec or just plain binary pattern matching make parsers suer easy to write in Elixir. I wrote a pretty complicated one for an old telecom data exchange format a few years ago and it was a breeze.

[freedomben]

I'm in the same place as you. I love using Elixir, but like you it doesn't feel very general purpose to me. I mostly just write Phoenix apps with it though. I went through Dave Thomas' book and it did feel like a mostly general purpose language when going through that, but of course those examples were chosen intentionally. It makes me think I just need to try more often. I'm so productive and fast with Ruby however that I always reach for that for scripts. I really need to buckle down and make myself write a non-trivial CLI tool in Elixir.

Part of what I suspect might make it feel less general purpose is that unless you spend time really learning the internals then it seems somewhat mysterious and constraining. The immutability for example (which most of the time I love) made it a nightmare when I was trying to process and transform deeply nested JSON. I tried a few times in Elixir and just bailed to Ruby where I could directly mutate stuff 5 levels down with ease and efficiency. The code seemed way more straight forward and readable.

How do people deal with things like deeply nested JSON in Elixir? Is there a way to make use of actors to avoid some of the pain points?

[grantjpowell]

> How do people deal with things like deeply nested JSON in Elixir?

Have you gotten to play with the `put_in/2` [0] and `update_in/2` [1] macros? They're designed to manipulate deeply nested structures like JSON

    iex(2)> my_parsed_json = %{"some" => %{"deeply" => %{"nested" => %{"key" => 1}}}}
    %{"some" => %{"deeply" => %{"nested" => %{"key" => 1}}}}
    
    iex(3)> update_in(my_parsed_json["some"]["deeply"]["nested"]["key"], & &1 + 1)
    %{"some" => %{"deeply" => %{"nested" => %{"key" => 2}}}}

As a side note, a common misconception is that updating a large data structure on the BEAM is inefficient because values are immutable, so you have to copy the whole structure to make a tiny change. This is untrue, as Elixir (and Erlang) "maps" are implemented as HAMTs[2], which support very memory efficient updates by "sharing" the unchanged parts between the the old and updated maps.

[0] https://hexdocs.pm/elixir/master/Kernel.html#put_in/2

[1] https://hexdocs.pm/elixir/master/Kernel.html#update_in/2

[2] https://en.wikipedia.org/wiki/Hash_array_mapped_trie

[akiselev]

Hard to say without knowing more about your usecase but normally I reach for lenses [1]

[1] https://github.com/obrok/lens

[nickjj]

I think it would be hard for Elixir to replace Python or Go for general purpose CLI tools.

Part of what makes Python nice is it's available everywhere. If you have a zero dependency CLI tool, using Python is nice because you can just run the script straight up. The standard library also has good support for argument parsing. I've written a bunch of little tools to help my daily workflow on the command line. I always reach for Python or Bash depending on what I'm doing. I haven't really seen a compelling reason to switch.

[romanoderoma]

> using Python is nice because you can just run the script straight up.

except when it doesn't work

which happens more often than not

Elixir is not probably best suited for CLI tools, given the BEAM has slow startup times, but people wrote scripts in Ruby, so it might be acceptable for someone

Elixir scripts can be distributed as releases which include the compiled modules bytecode and the VM to run them or as escripts, which are binary executable that can be run on any system with Erlang installed

[deltron3030]

New Elixir thread -> nickjj pointing out the superiority of Python or Ruby. Lol!

[enraged_camel]

No, Elixir does not aim to be a general-purpose language. It is built for a virtual machine that greatly excels at distributed, fault-tolerant systems.

[ch4s3]

Are you sure about that? I heard Jose say that they did aim for it to be general purpose during a talk at ElixirConf last week.