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You’ve heard that Clojure is great for concurrency. But what tools does Clojure give you? And how should you use those tools?
These lessons are meant to each answer a specific question and help you build the skills you need to address a wide variety of concurrency problems.
Clojure core.async provides basic building blocks for communication and coordination. This course explores ten patterns you can easily implement using those building blocks.
With so many data formats out there, it’s good to see some example code for reading and writing different formats. I’m talking JSON, CSV, EDN, and more. This course explores how to read and write data formats using Clojure.
In Clojure, the common advice is “just use a map”. There’s some truth to that, but it’s obviously more complicated. Clojure gives you lots of ways to model a problem. In this course, I give you a peek behind the curtain. I work step-by-step through different iterations of a domain model, discussing what I’m thinking, why I’m trying something else. We model the game of solitaire, a card game we’re all familiar with.
Ever wonder how to read those destructuring forms? Do you want to know how to make your code clearer and shorter? Where can destructuring be used? And how do you construct each one? This course starts from the basics and works through all of the destructuring forms, ending with some examples and advice for using them.
Pragmatic and in-depth guides to a topic.
A complete massive action plan to get a functional programming job.
Getting to know people who can help you get functional programming jobs.
How do we deal with that little bit of time between when the user clicks and the server confirms the change is saved? Well, like many things in life, there are two ways: optimistically and pessimistically.
Your Database is going to contain a lot of important information. When you鈥檙e first starting out your app, you don鈥檛 know exactly what you鈥檙e going to store in there. In addition, you don鈥檛 know how you鈥檙e going to want to access it. Both of these will evolve over time as you understand more of the domain and you uncover the complexities of your UI. We want some help from the framework (Re-frame) to help us deal with this evolution.
Re-frame adds a beneficial amount of structure to your frontend app. This guide goes over all of the pieces of that structure and how to use them.
We look at a sequence diagram to organize the parts of Re-frame.
Small, precise guides to a particular feature.
Setting up and tearing down a test database can be slow. Use a rolled back transaction to quickly reset the database to a known state. You can do that in an `:each` fixture to run each test in isolation.
As you get better with Clojure, it becomes easier to read. Why not jump ahead of the learning curve and read like an expert? Focus on the first thing, use the indentation, and read the evaluation order.
New Relic lets you get more out of Heroku. Install it in 7 steps.
Reference: Idiomatic way to represent sum type (Either a b) in Clojure how do you represent sum types, also known as tagged unions and variant records? Something like Either a b in Haskell or Either[+A, +B] in Scala. Either has two uses: to return a value of one of two types or to return two […]
Function application is a key concept in lambda calculus. While it is commonly expressed using parentheses in Clojure, it is also reified into a function which itself can be applied to another function.
Clojure is well-suited for processing JSON, but there are some decisions you have to make to suit your application. The major decisions are actually easy, though they took me a while to figure out.
Clojure startup times suck. Let’s just be honest. How do Clojure programmers live with that? Maybe that’s the wrong way to think about it.
Clojure core.async is a way to manage mutable state. Isn’t that against functional programming?
The JVM’s garbage collector allows for Clojure’s persistent data structures to be practical. It’s one of the benefits of being a hosted language: you can take advantage of the millions of dollars invested into the JVM’s development.
When you’re working at a company, you usually inherit their deployment system. And that’s great because then you just do what they do. But what if you are on your own? What are the options for deploying a Clojure server?
The JVM JIT is a highly optimized compiler. I present some resources for learning what it does.
Lambda abstractions are always leaky, but some are leakier than others. Clojure programmers recommend keeping most of your functions pure and containing the leaks as much as possible.
Parts of courses on specific topics
Property-Based Testing has several advantages over regular Example-Based Testing. It’s worth calling them out.
Agents are another reference type. Each one has a queue of work to be run on it, and those bits of work get run in a thread pool. They’re great because each Agent is a unit of parallelization. Three Agents mean three things can run at the same time.
Flow is a mental state where we feel totally immersed in our activity. We feel deep enjoyment and are energized by it. It’s the state the repl-driven programming promises us. In this lesson, we look at Flow, its benefits, and what is needed to maintain it.
In this lesson, we will see an example of the process of testing an existing function using Property-Based Testing.
Let’s take a look at the `day-at-the-bakery` function and see how we can improve it.
We make note of some duplication and make a plan for removing it.
PDFs, code, and other downloads to help you learn
A one-page sheet with the basics for creating Reagent components for use with Re-frame. Get started with Re-frame right away.
If you program the web in Clojure, you probably use Ring. Even if you don鈥檛, your server is likely聽Ring compatible. Ring has a small SPEC. It鈥檚 centered around defining the keys one can expect in the request and response maps. And the exact names for keywords are easy to forget. I don鈥檛 want to forget. […]
These are all of the commands Eric uses to do TDD in Cider.
Code to accompany The Ultimate Guide to Clojure Concurrency and the Clojure Concurrency Course. It’s example code for a variety of concurrency primitives.
We interviewed Asher Coren about his upcoming Clojure/conj 2016 talk.
We interviewed Bill Piel about his upcoming Clojure/conj 2016 talk.
We Interviewed Brandon Kase about his upcoming Curry On talk called Composable Caching in Swift.
We interviewed Brian L. Troutwine about his upcoming Lambda Days 2017 talk.
We talked to Caitie McCaffrey about her upcoming YOW! Sydney 2016 talk.
Chris Birchall will be speaking at Lambda World 2016. I interviewed him about his talk.
Issue 332 – June 24, 2019 路 Archives 路 Subscribe JVM Tool 馃敤 jEnv The JVM has always been a very stable platform, and releases were seldom. You could get away with running a single version of Java for years. That’s no longer the case. Java 9 introduced some breaking changes, so many people are […]
Issue 331 – June 17, 2019 路 Archives 路 Subscribe Clojure Tool 馃敤 shadow-cljs I’ve never used shadow-cljs on a production project, so this week I rolled up my sleeves and used it for a new thing I’m working on. I was quite impressed. shadow-cljs is a complete project tool, like Leiningen. It does all […]
Issue 330 – June 10, 2019 路 Archives 路 Subscribe Clojure Tool 馃敤 Figwheel If you’ve done any ClojureScript development, you must have heard of Figwheel. If not, get ready for your socks to be knocked off. Figwheel brings live coding and Repl-Driven Development to the browser. It watches your code files for changes, recompiles, […]
Issue 329 – June 03, 2019 路 Archives 路 Subscribe Clojure Tool 馃敤 cljdoc cljdoc is awesome. It can generate documentation for any Clojure project. Do try it on a test project you or someone else has created and published to Clojars. It generates beautiful documentation. Besides the documentation, the site has lots of helpful […]
Issue 328 – May 27, 2019 路 Archives 路 Subscribe Clojure Tip 馃挕 don’t use def inside a defn Unless you really have a great reason, defs inside of a defn are generally incorrect. If you really do have a good reason, there should be a comment saying why you’re doing it. You probably don’t […]
Issue 327 – May 20, 2019 路 Archives 路 Subscribe Clojure Tip 馃挕 always be decomplecting Decomplecting is design. It’s a way to understand a problem better. And code is an encoding of the understanding we have of the problem. always be decomplecting asserts that our code should reflect the contours of the problem. Whenever […]
Guy Steele is an amazing figure. He was instrumental in writing the specs for C, Common Lisp, Scheme, and Java. He’s also a great speaker. His talks are always concise and to the point. He seems like such a nice guy. He never says anything harsh!
