Elixir & OTP
Elixir and OTP have some funky lingo.
GenServers? What a strange name.
Supervisors? Sounds kinda bossy.
Agents? No thanks, I'll broker my own deals.
If this lingo sounds like complicated gobbledygook, you're not alone. It was initially foreign to us, too. It didn't fit with other things we knew, and so it felt daunting and "advanced".
So we just kinda went with it (cargo culting, anyone?)
Copying code works right up until you need to change it to suit your needs. Then you smack up against a wall of frustration. You fiddle with the code, but it doesn't work the way you expect. Troubleshooting the problem seems out of reach. And while StackOverflow offers a lot of tidbits, it doesn't answer the questions you have.
Elixir and OTP are enticing because they have a lot of cool magic. But without a good understanding of how it all works, you can't pull the rabbit out of the hat. We know because we tried several times... and nearly ended up exiting stage left.
And then we finally discovered the secret to OTP.
You've probably heard that OTP is a set of abstractions for writing distributed, concurrent programs. That's true. But the secret is that the code behind those abstractions isn't "advanced". In fact, it's fairly ordinary Elixir code. With a basic understanding of Elixir processes, you could write a lot of OTP yourself. Thankfully, you don't need to.
And yet, initially it can feel like smoke and mirrors.
“In other courses, I just learn how to use Phoenix, GenServer and Supervisor like magic. Here I learned the foundations, how those components were built, and how it works under the hood. This course was awesome!”
What if you could move from clumsy mumbo jumbo to fluent familiarity?
Elixir, Phoenix, and LiveView development would be fun, not frustrating. You could write Elixir as effortlessly as any other programming language in your toolkit. You could wield all the power of OTP with ease. No more mystery. Everything would finally click. And you could confidently build anything you wanted!
You can do all that because we did all the research for you. 👍
No need to scour the web and waste your time piecing together resources. We spent about a year distilling everything we've learned about Elixir and OTP into an approachable yet comprehensive video course. It's the course we would have wanted—the course we needed!
Our course is different because it doesn't start with the abstractions. It starts with pure Elixir and builds up to the abstractions so you know when and why to use them. We focus on one concept at a time and one clear explanation at a time. In turn, you get one "AHA!" moment time after time.
It's also different because you see exactly how everything gets put together to build a real Elixir/OTP application. No theory or hand-waving here. Nothing is held back: we tackle the complexities of OTP by breaking it down so everything makes sense. It's a course for experienced, busy developers who want to build something now!
“I was a little reticent at first to buy the course because I've been doing Elixir for almost 4 years now, but... I was soon picking up things that had passed me by. Before long I was starting to deeply understand things that I'd been kind of taking for granted like processes, tasks and now GenServers. The way that you start off with plain ol' Elixir and build up to the point where we need the things that you are explaining is brilliant!”
Building a small, Phoenix-like web framework from scratch is a fun and engaging way to learn all the facets of Elixir and the standard OTP libraries. It requires:
- modeling with structs and other data structures
- pattern matching to transform HTTP requests to responses
- file and socket I/O
- handling requests in concurrent processes
- running asynchronous tasks
- storing state in GenServers
- using Supervisors to recover from failures
We build this application step by step in a clear, logical progression. You see every move, every change, and every refactoring firsthand. It's as if we're sitting down together building the app from start to finish.. And yeah, there are a few bad puns along the way, but we do try to make it fun. 🤪
“This is by far one of the best tutorials I've ever paid for! So many other tuts just cover the basic entry level things such as types and immutability along with building a toy application (no real world basis). Building the HTTP Sever was excellent because as it shaped up I was like, 'We are building a rough draft of Phoenix'.”
The live-coding videos (6 hours total) are laser-focused on advancing the app one feature at a time. Each video is:
- easy to digest (36 bite-sized videos in total)
- straight to the point without any rambling or fumbling
- perfectly paced so you're not left behind or nodding off
- streamable with English subtitles and also downloadable
“[T]he level of depth that the course goes into is insane. Anything that seemed like magic before has been entirely explained in such a clear way that I feel like I would know exactly when to use the features and even have ideas of real world implementations in my head now.”
Seeing code is hardly enough. You also need to see the entire system at work. Each of the 22 narrated animations throughout the course give you:
- a solid mental model for how everything fits together
- a visual explanation that takes the mystery and magic out of OTP
- the key to becoming the magician instead of the mystified!
“I loved the graphics that were used to introduced concepts, the practical examples, and how it all demonstrated the features of Elixir in a way that removed the magic surrounding things like supervisors, GenServers and routing that is used in Phoenix.”
Of course you get all the source code for the final app, and also versions of the app for each course module. Yup, that includes the tests, too!
Here's the kicker: you need deliberate and directed practice to make all this "stick". That's why you also get 56 exercises reinforcing and cementing what you learned in the videos. It's not just hands-on experience, it's also mind-on experience!
“I've worked with Elixir for a couple years now, but learned more in your course than I did in all the other Elixir books I've read. It is far superior to other guides which tend to cover a broad range of things and make it hard to associate the content with real-world problems. Each new idea, technique, feature and library in your course was introduced at relevant points that really helped me connect the dots.”
Get started today!
No monthly subscription. No time limit. The course is always in your Pragmatic Studio account so you can revisit it over and over again.
In no time you'll go from "Argh, I'm lost!" to "Aha, now I TOTALLY get it!"
“This was by far the greatest single course I've ever watched start to finish (it was just that good)! This course sets the bar like none other.”
Meet Us In This Video
The Full Course Outline
Welcome! After taking a peek at the type of app we're going to build in this course, we'll help you get your development environment set up so you can start coding Elixir.
Elixir has conventions for organizing projects and great tooling to automate project tasks using mix. We'll get a quick lay of the land, learn various ways to run Elixir, and jump right into code!
Our web server will make three high-level transformations—parsing, routing, and formatting a response—with each step being a function. We'll set up an initial pipeline using modules, named functions, strings, maps, and the pipe operator.
To transform a request into a response, we first need to parse the request string into a more usable data structure. This presents a great opportunity to learn the match operator, pattern matching techniques, atoms, and built-in functions.
Formatting the response string takes us deeper into Elixir maps and introduces us to programming with immutable data, which is a hallmark of functional programming.
In Elixir you don't use conditional expressions as often as you would in imperative languages such as Ruby. Instead, it's more idiomatic to control the flow of a program using function clauses and pattern matching. Routing HTTP requests gives us an ideal context for learning how to design code in this declarative style.
Designing a web server presents interesting scenarios that let us explore many of Elixir's features. How do we handle a request that has parameters? What happens if a route doesn't match? And how should we respond? The solutions require more pattern matching techniques and multi-clause functions.
Once we have requests flowing through a pipeline, we can plug in specialized functions that transform requests and responses in unique ways such as rewriting paths and tracking 404s. By pattern matching maps we can run these functions conditionally—a powerful techniques that's used extensively in Elixir applications.
Even something as familiar and straightforward as reading a file involves pattern matching. Serving static files, and properly handling successes and failures, introduces us to tuples and case expressions.
Sometimes you need to attach metadata to a module, be it for documentation or to squirrel away a compile-time constant. In this section we use reserved and custom module attributes.
Modules let us organize functions with similar concerns in a namespace. We'll group related functions in properly named modules, put them in separate files, and knit it all back together using aliases and imports.
One of the benefits of modeling our request/response conversation as a struct (as compared to a generic map) is we can ensure that the functions in our pipeline always get the expected type. In this section we compare structs vs. maps and refactor our design to use a struct.
Handling a POST request means we have to take into account the list of request headers and the POSTed parameters. To do this, we'll process the request by matching head and tail patterns: a technique used pervasively in Elixir apps.
Recursion makes Elixir go 'round and 'round. You've no doubt seen simple examples of recursion, but what about real-world use cases? Turns out, recursion is exactly what we need to parse the HTTP headers in our POST requests. And while Elixir has convenience functions that often let you sidestep using recursion directly, Elixir pros know how to use recursion to their advantage.
You'll find familiar high-order functions in the Enum module for transforming data. But to use them effectively you need to be comfortable with anonymous functions and how to capture functions. We also put guard clauses to good use as our application begins to take the shape of a familiar web framework.
Now it's time to generate dynamic content by reading and evaluating template files. We make quick work of this using comprehensions to iterate through collections of data and generate HTML.
Since Elixir is the language you use to build Phoenix web apps, a peek at a Phoenix app reveals a lot of familiar syntax and design concepts. Alas, you discover there really is no magic after all!
It's time to automate with ExUnit tests! We look at two different ways to write unit tests, and various ways to run them. By the end we have green dots across the board.
To build a JSON API, we install an external JSON library and use it to render JSON and handle POSTed JSON data in response to API requests.
Now that we have a fully-functioning HTTP request handler, it's time to write a TCP socket server so that any HTTP client can interface with our application. To do that, we use Erlang's gen_tcp library and learn how to transcode Erlang to Elixir. Cue the browser!
At this point our web server can only handle one request at a time. We need a way to handle multiple requests concurrently and also isolate the failure of one request so it doesn't affect other requests. Concurrent, isolated processes are what set Elixir apart from other functional languages! We also look inside the Erlang VM to see how it takes full advantage of multicore computers to achieve remarkable levels of concurrency and parallelism.
So if processes are isolated and run concurrently, how do they communicate? Just like people! They send asynchronous messages to each other. In our app, we spawn a series of API requests that run in independent processes. They send back their results as messages to be received by the request-handling process. We also look at how to avoid unwanted synchronization points in our code.
With several one-off asynchronous tasks now running and getting results at a later time, we're starting to see a definite pattern. In fact, running functions (or tasks) in a short-lived process is so common that Elixir provides a helpful abstraction: the Task module. By the end you'll know how the Task module works under the hood.
Now we turn our attention to long-running server processes that manage internal state and respond to various messages. We build up from a basic receive loop to a client API that sends synchronous and asynchronous requests to a registered server process. Along the way, we see how a server process preserves the integrity of its state while under load from multiple concurrent client processes. By writing a server process from scratch, we begin to demystify the "magic" of a GenServer.
Looking at our stateful server process, we see two flavors of code: code that's common to all server processes and application-specific code. So what happens when we move all the common code into a generic module? Well, we're not the first ones to have that idea! GenServer is a design pattern (an OTP behavior) that helps us write server processes with greater ease. By refactoring our server process, you'll come away with a better understanding of how (and why!) GenServer works.
When you're starting out with Elixir, writing a GenServer can be confusing and it's tempting to just cargo cult from example code. But we want you to feel really confident, so we've been incrementally building up to using a GenServer. Spoiler alert: Now that you understand the underlying design pattern and how it's implemented, actually using a GenServer is a snap! Besides converting our app to use a GenServer (and eliminating a bunch of code!) we also add new application-specific behavior to our GenServer.
As another practical example of when and how you'd use a GenServer in a real application, we write a server process that performs background work on a periodic interval. This lets us explore the power of the handle_info callback in greater depth so you can take full advantage of all that GenServer has to offer.
At this point we have three server processes that should run continuously without missing a beat. Alas, things don't always go according to plan! We need a way to monitor the server processes and recover when trouble strikes. To do that, we start by linking processes, which is fundamental to understanding how the OTP Supervisor behavior works.
Normally, designing an application that's resilient to failures is a tall order. With other languages, the best you can do is to code defensively. Elixir is different: it frees you to "let it crash." That's only possible because OTP Supervisors offer unparalleled support for detecting and recovering from process failures. Indeed, Supervisors are the key to building high-availability, fault-tolerant systems. We design a supervision tree so our application can elegantly recover from unforeseen failures.
Up to this point we've been using the term "application" fairly loosely. But an Elixir application is a first-class OTP entity. We look at how an application works behind the scenes, and then specialize the OTP Application behavior to start our supervision tree.
For Experienced Developers
Power up with Elixir and get ready for Phoenix and LiveView!
To respect your time in the videos, we assume you have project-level experience with another programming language.
For that reason, you definitely don't need a whole video on Elixir numbers and strings. Reference courses like that are booooring. But you also don't want to jump right into asynchronous messaging between two supervised GenServers. Whoa, that's totally frustrating too.
“Most courses have the wrong pace for experienced devs. Yours is balanced perfectly (enough detail to learn and not get lost, but also a relatively fast pace and focus on idiomatic aspects).”
When a course makes the wrong assumption about your experience and the pacing is flawed, you're left hung out to dry.
This course aims for the sweet spot by:
- taking a practical project-based approach, not a sluggish syntax-approach
- deconstructing the underlining principles before introducing abstractions
- assuming you have programming experience, just not with functional programming or Elixir
“I loved this course! It really hit the sweet spot of teaching me Elixir and OTP. Building a web server from the ground up really helped me to understand how Elixir apps fit together.”
Created with 💛 by
Mike and Nicole Clark
We've been using Elixir and Phoenix since their early days. Initially though, learning the language was a steep learning curve for us (and we're experienced developers, no less!). It took us three different attempts to scale the mountain of Elixir and OTP.
Every book and course we picked up was either mind-numbingly slow or mind-blowing fast. The Elixir language and abstractions seemed neither approachable nor engaging. But onward we climbed. Slowly we were able to say "Aha, now that piece of the puzzle makes sense."
Imagine how much head-banging we could have saved with a practical, project-based course. One with the right pacing to make Elixir and OTP approachable, pragmatic, and enjoyable to learn. So that's why we made this course. It's the course we wish we had when learning Elixir and OTP and we think you'll find it to be an invaluable companion on your journey.
We also have three other Elixir and Phoenix-related courses for you : Multi-Player Game with Elixir, Phoenix, Vue and Elm, Full-Stack GraphQL with Absinthe, Phoenix, and React, and Phoenix LiveView. We hope you enjoy them all!
Many thanks to Scott Thompson, Clinton De Young, and Nathan Herald for taking the time to review early drafts of the OTP sections. Your insights and suggestions based on hard-won experience with Elixir/OTP were instrumental in the design of this course. We really appreciate it!
Thousands have loved learning Elixir and OTP in the Studio!
Here's what some of them have to say…
“I loved everything about this course, especially how you build out the behavior provided by the OTP library in order to understand what is happening underneath the hood. It was very useful in order to grok GenServers and Supervisors. Over the years you have helped me progress in my career as a programmer. I don't know where I would be without your courses. Thank you so much! Please carry on!” Gabe Lafontant
“I wish I found these courses when switching to RoR. After a few videos it seems like my dive into Elixir will be waaaay easier (even though I hate video courses in general)... Most courses have the wrong pace for experienced devs. Yours is balanced perfectly (enough detail to learn and not get lost, but also a relatively fast pace and focus on idiomatic aspects).” Weronika Łabaj
“This was by far the greatest single course I've ever watched start to finish (it was just that good)! This course sets the bar like none other.” Toran Billups
“Best course I've ever taken. Even if Elixir is not your weapon of choice, this is a fascinating journey over some incredibly powerful concepts and ideas, that will make you a better developer. Amazing. 🙌 Always hated learning the language before "doing stuff", but this one makes it super interesting and very clear.” Josef Richter
“I'm so impressed with the @pragmaticstudio Elixir course. They show you how to build parts of Phoenix/OTP rather than just how to use them. [The course] is also great for learning best practices for designing and refactoring Elixir APIs. The @pragmaticstudio Elixir course is worth much more than the purchase price. If you want to get deeper into Elixir, you should own it! Really awesome learning experience!” Bill Peregoy
“Learned a lot from the pragmaticstudio [Elixir course] and couldn't recommend it highly enough.” Ralph Bankston
“The way you built an application piece by piece worked really well. This is my favorite way to learn a language, and building an HTTP server was an ideal project for learning Elixir's full range of capabilities. This is one of the best video courses I've ever seen!” Kim Godard
“I've read almost 3 books on Elixir yet this course taught me small tricks that I didn't know before. I attribute that to the realistic project that is being developed throughout the course instead of the typical book-style teaching in which the language features are presented almost like documentation. This course is taught with just the right amount of detail and speed, and the realistic example project really helps to solidify the concepts being taught. The course notes are well thought-out and thought provoking in that they anticipate questions a developer may have which extend naturally from what is being taught, especially questions like 'could I do this a different way?'” John Joseph Sweeney
“The course was great! I'm starting on Elixir (coming from Ruby) and the course helped a lot. Awesome work! It's worth every cent and, most importantly, every second spent watching it!” Franco Catena
“The @pragmaticstudio course on Elixir/OTP is excellent. They walk you through creating a lightweight version of the Phoenix router, controller, view & templates... so you gain a better understanding of how @elixirphoenix is built. Highly recommended.” Nathan Hopkins
“Loved the Elixir course! Amazing flow! I really loved how you took the time to explain things that matter (without glossing over small details) and that we basically built GenServer from scratch. This gaves me a much much better understanding of how Elixir/Phoenix works.” Edison Yap
“@elixirlang is the coolest tech I've using lately. Not 100% sure if I find it more enjoyable than Ruby, but mind blowing idioms + so fast. Best I've found to learn is the course by @pragmaticstudio...project-based always works better for me.” Steve Corona
“What a fantastic job you've done with the Elixir course. I was a little reticent at first to buy the course because I've been doing Elixir for almost 4 years now, including a couple of production apps, but I needn't have worried. I was soon picking up things that had passed me by. Before long I was starting to deeply understand things that I'd been kind of taking for granted like processes, tasks and now GenServers. The way that you start off with plain ol' Elixir and build up to the point where we need the things that you are explaining is brilliant! The way you introduced GenServers in particular is perfect.” Alan Gardner
“Excellent explanation of Elixir and OTP concepts” Jørgen Orehøj Erichsen
“I really loved the explanation of the various parts of OTP / Tasks / etc. I've been trying to wrap my head around GenServer, Task, Agent, and Supervisor. This course finally made these things click for me! I especially liked the way you made your own variant of GenServer first and then moved from there to using Elixir's version. At that point it finally dawned on me that it's all just functions, not magic!” Jacob Atzen
“I really enjoyed this course and will recommend it to any budding or experienced Elixir devs. I liked the project-focused lessons and the pacing of progression through Elixir fundamentals within the context of building an app. The animations were great and really served the course explanations well. And the sections towards the end dealing with Tasks, Agents, GenServers and Supervisors were all excellent!” Paul Fioravanti
“Really enjoying the @pragmaticstudio Elixir course. It doesn't waste any time. The notes add extra interesting tidbits and the exercises allow me to practice. I also like that the main thing built is a web server, which gives some insight into Phoenix. Highly recommend!” David Tang
“I have done all your courses, but I think this is the best one, which is quite staggering as all the other courses were top-notch, too. I liked how you unpacked existing libraries and especially the Phoenix framework. It was a wonderful experience to see how all the things you carefully set up came to together. Also, the notes were not just summaries but contained so much valuable extra information. So well done!” Johannes Rubenz
“Awesome work! Definitely the best resource that I've found on Elixir. Can't wait to start the next course!” Nathan Queija
“Really well done course! The recursion explanation was the best example I've come across for us newbs. I like how it was built step-by-step with output, never rushing the discussion.” Dan McHarness
“Even though I'd used a bit of Elixir / Phoenix before, it was super helpful to build these Elixir features from the ground up in your course. I got a much better understanding of how things work under the hood. Your attention to detail is unparalleled and the course was engaging and fun. Thank you for the great quality course..” Eleni Lixourioti
“I've been working with Elixir for two years now but never had the need to dive into OTP much. This course absolutely exceeded my expectations. Building up a web framework from scratch was quite an eye opener. I only wish I took it sooner!” Chase Pursley
“Thanks for the way that you make learning Elixir a joy! I really like the way you explained the topics and helped me understand how things work under the hood.” Andrés Felipe Gallego S.
“I'd already learned a bit of Elixir but this course solidify my understanding and demystified OTP. I don't normally like video courses for coding, but yours was highly professional and explained the concepts very well. Well worth the money.” George Millo
“I feel like I have a much firmer grasp of things like process creation, spawning, linking, and how those lead to setups like OTP because of this course (after having read a zillion articles and at least one book already on the topic). I'll definitely be signing up my other developers for this course!” Donald L. Merand
“I highly recommend the Elixir/Phoenix courses from @pragmaticstudio. Best dev learning videos I've ever seen and built by great people.” Peter Hood
“I've stuck my toe in Elixir before, but this course really made it click for me. I loved that everything was built from the ground up. So rather than simply saying, "Here's what a GenServer is and how it is used" we built our own version - running into problems, coding solutions, and eventually understanding the entire thing. Then, it was just a matter of moving it over to GenServer. I feel much more confident that I could jump into Phoenix now that I understand Elixir and OTP better.” Josh Cochran
“I also appreciate the way you made the learning curve into a learning line. What I mean is that each new step feels like a consistent and comprehensible increase in complexity. It is not 'Lecture 1: 1 + 1 in Elixir. Lecture 2: Asynchronous messaging between statefull processes'.” Ondrej Pinka
“This is one of the best courses I have taken in my life! It's concise and covers the most important topics about Elixir and OTP and has a lot of exercises. The notes are fantastic and the instructors are so captivating, with a great chemistry between them. What a pleasure it was to take this course!” Francisco Breno Barbosa Soares
“Two things made your Elixir/OTP course stand out compared to the other numerous online courses I have gone through. First, your top-level discussions of Elixir as a language and its design principles were excellent. These concepts are difficult to communicate, and you really excelled here. Secondly, you did not skimp on any of the important details nor did you get bogged down on unnecessary minutiae. This is a hard balance to strike, but you all really nailed it!” Johan Uribe
“The flow of this course was very well thought out, and the material was presented at a pace that was just right. Mike and Nicole did a great job avoiding tangents and minutia while still conveying the necessary information. I’m very pleased and glad I bought this course!” Ed Barstad
“I am a Pragmatic Studio alumn and have always thought the quality of their courses is top notch! Mike and Nicole's style is really friendly, welcoming and easy to follow. The pace is great with short videos that tackle one thing at a time. Very much like functions (wink).” Miguel Barcos
“I liked everything about this course: it was well organized, well paced, interesting, and fun!” Kevin Shank
“The material was presented in a really well structured way so that learning was gradual. I particularly loved hand-rolling the GenericServer before revealing that it was pretty much a GenServer, thus increasing understanding and making GenServer less magic. Everything was well-paced too!” Ben Booth
“What I liked best about this course was that we built our own implementations first, before using the built-in Erlang/Elixir solutions. Keep on making awesome courses and I'll keep buying them!” Bas Bloembergen
“I liked that many of the lessons in the Elixir course started with simple code to solve the problem at hand, and then "shazam!" there was a big reveal transforming it into idiomatic Elixir code using the standard OTP libraries. That approach really helped me get a handle on why things are the way they are in Elixir. The whole production was very well put together. It was well constructed, and had an excellent flow to it.” Dan Dorman
“I've worked with Elixir for a couple years now, but learned more in your course than I did in all the other Elixir books I've read. It is far superior to other guides which tend to cover a broad range of things and make it hard to associate the content with real-world problems Each new idea, technique, feature and library in your course was introduced at relevant points that really helped me connect the dots. Thank you for this really helpful course!” Rocky Neurock
“Finished the Developing with Elixir/OTP course by @pragmaticstudio I have to say the level of depth that the course goes into is insane. Anything that seemed like magic before has been entirely explained in such a clear way that I feel like I would know exactly when to use the features and even have ideas of real world implementations in my head now. I think this course is an absolute must to anyone learning @elixirlang.” Roberto Pando
“@pragmaticstudio's Elixir/OTP course was outstanding. Really helped me get my head wrapped around Elixir finally. I really recommend it!” Dave Sanders
“I really like how you built up the different parts of the language piece by piece, dispelling the magic, whether that was a web server, Phoenix, or a GenServer. You are phenomenal teachers! Thanks for sharing your gifts, your passion, and your knowledge.” Monte Johnston
“I have been taking courses with The Pragmatic Studio since 2006 and I'm always amazed by the careful attention to detail that's displayed throughout all their coursework. I really like the animated diagrams and code examples throughout this course. Mike and Nicole totally knocked it out of the park for me! Thank you for being truly awesome educators throughout my educational journey.” Conrad Taylor
“This is hands down the best online course I've ever taken on anything! You kept me interested at every step and I now understand complex concepts I never thought I would. You opened a whole new way of thinking for me. For the first time in my life, I have a solid understanding of a programming language and know what I'm doing 99% of the time. Amazing!” Josef Richter
“I had heard good things about The Pragmatic Studio before taking the Elixir course, but now I know for myself that you two are top notch educators. Things were spaced out just right to help "exercise" my memory. I just absolutely loved the course. I don't think it could have been better.” Levi Kennedy
“Fun afternoon learning some functional programming with Elixir. Wonderful course from @pragmaticstudio. Highly recommended.” Ed Wallitt
“I loved that this course showed the primitives of Elixir and Erlang in detail before introducing the nice-to-have abstractions. This was fantastic for understanding the "why" behind the abstractions!” Chaz Watkins
“The content was well paced for someone like me with plenty of experience as a developer coming to a completely new paradigm. Your lightness of touch and humor make the material really appealing. I also really appreciated the way you hand-rolled a task or a generic server before going on to demonstrate the implementations in the standard library. That really helped to demystify these most "magical" of aspects of using Erlang/OTP/Elixir.” Dan Bye
“I jumped right into Phoenix but I was glossing over a lot of the details of how things worked, which proved troublesome later on. I now have a strong understanding of Elixir and OTP. Thank you! I can't wait to get started with my own project!” Tom McGurl
“If you want to learn Elixir in a practical way, I strongly suggest the @pragmaticstudio course. Definitely the best online course.” Bruno Dusausoy
“This is the best Elixir material I've used. You build a simple HTTP server using Elixir and learn a lot of the core language and architecture choices when writing Elixir code. It doesn't pester you with 'this is an int, this is a string.' You just start building this HTTP server out and learn about Elixir along the way. Thanks Mike and Nicole for writing such a tremendous course! It really cemented my Elixir knowledge and I feel much more comfortable in my Elixir role.” Sergio Tapia
“I love the pace. It feels more like a series of really good pair programming sessions with a mentor and less like a lecture.” Hunter Stewart
“This course by @pragmaticstudio cleared everything up for me 😀 ” Omar Bahareth
“I really enjoyed the thoroughness of your Elixir and Rails courses. I think you guys have the best programming courses on the web. Your explanations are consistently clear, the pacing is excellent, and I particularly appreciate the way you focus on conceptual understanding and orientation, rather than just rattling off how to do something. Thanks for offering such great training” Haiz Oppenheimer
“I loved everything about this course...the project-based approach, the realistic project in terms of technologies and choices, and how we built out things that also taught us how Phoenix worked. This course demystified a lot of things, and made approachable a lot of different concepts. Simply put, amazing work! I feel comfortable now looking at Elixir as a solution to problems. As a pair, you two do a great job. Hurry up and make more video courses! I'd serious learn a new language just because you two teach it.” Jason Lotito
“great elixir course! #myelixirstatus” Arif Yayalar
“I love the clear explanations as well as all the diagrams— they've helped me tremendously! The section on Sending and Receiving Messages in particular is wonderful.” James Schorr
“Superb job! The course has been very thoughtful in creating problem situations that iteratively lead to an ideal solution, with the benefit of helping the student understand the rationale (the "why and how") along the way. The experience has been fantastic!” Yong Bakos
“This course was awesome! In other courses, I just learn how to use Phoenix, GenServer and Supervisor like magic. Here I learned the foundations, how those components were built and how it works under the hood.” Maxsuel Maccari
“Building from first principles in this course was very helpful. Solid course!” Kenny Parnell
“I liked the depth at which Elixir was covered. So many other tuts just cover the basic entry level things such as types and immutability along with building a toy application (no real world basis). Building the HTTP Sever was excellent because as it shaped up I was like, 'We are building a rough draft of Phoenix.' The real money of this tutorial was from Section 20 on. WOW! I was so impressed with what was covered and the ideas were really churning. This is by far one of the best tutorials I've ever paid for! I’m really impressed with your teaching methods and delivery; keep up the amazing work!” Cody Brunner
“Loving @pragmaticstudio's Developing With Elixir course #myelixirstatus” Kyle Oba
“A really fun course, presented stellarly! Your obvious mastery of both the language and tooling made for a smooth-flowing, informative course. The notes at the end of each section are also helpful and enlightening. Loved the course! I've already bought the Elm and Unpacked Bingo courses too. Excellent job!” Ohad Frenkel Keshet
“Want to learn @elixirlang (and you should), then you owe it to yourself to check out @pragmaticstudio. Awesome!” Napoleon Ahiable
“I have done a reasonable amount of Elixir & Phoenix programming and I’ve started to use OTP a lot more. The way this course builds up everything without Phoenix and goes through OTP step by step is really good! Lots of "gaps" in my understanding have been filled. I really liked the approach you have taken to build up an app!” Steve Forkin
“I've been learning a lot of Elixir for the past few weeks. And thanks to the Elixir/OTP video course by @pragmaticstudio, with their great teaching and real code examples, I've found a programming language that I already love. And that wouldn't have happened only with books” Jorge Ania
“I absolutely love this course! You have one of the most complete and easy to understand tutorials on GenServers out there. Pragmatic Studio is certainly THE BEST site for online developer training! Thank you for all you both do.” Clinton De Young
“The way you designed this course to reveal the 'magic' behind the libraries is fantastic. The pacing was spot on. One of the best programming courses I have ever taken!” Aaron Graham
“Elixir is an itch I've been wanting to scratch for sometime, but having tried to learn it using manuals or website tutorials, I've not found the experience engaging. This course, however, has been so rewarding! The pace, level of detail, assumption of prior knowledge, and depth of explanation are all perfect. The video quality, font sizing, colour scheme and sound reproduction all add to the quality of the whole course. And your approach of developing a web server app in the course and getting to see how all the pieces fit together is so much more absorbing than trying to learn by writing bite size chunks of unrelated code. Well done!” Tony Sutton
“I love the logical, sequential way you build up an increasingly robust application and explain at each step of the process why things work as they do. Your visuals are thoughtfully crafted to illustrate important concepts. I wish the course hadn't come to an end. I not only would recommend this course, but I bought a 10-person license for my team!” James Lavin
“I really enjoyed the structure of the Elixir course which really helped me understand many of the core ideas, such as GenServers. You helped take away the magic that can come when learning a new language and ecosystem. Great job!” Michael Degli-Angeli
“Best course ever! It has a unique way of explaining the whole Elixir ecosystem in detail with real-world examples and use cases, and also one of the best explanation of the OTP internal functionality. Totally worth the money.” Emilio Forrer
“What an excellent course! Right when a question came to mind, you cleared it up, plus a little bit extra with all the gotchas. I originally hadn't planned to use Elixir any time soon for a real project, now I can't wait to use Phoenix and LiveViews for my next project.” Thomas Keppler