Clojure Koans An invitation to FP for Clojure noobs I’ve heard newcomers to Clojure ask how to get started with functional programming. I believe that learning to program in the functional style is mostly a matter of practice. The newcomer needs to become familiar with a handful of higher order functions, and how they are used in common idioms. This can be done by practice with simple, well defined problems. Here is what I propose. I have packaged the problems as a Leiningen project. What I recommend is deceptively simple. Here’s the important point: once you understand the solution, delete it and then reconstruct it. Here are a few things to avoid. Do not attempt to learn Clojure and new tooling, say Emacs+slime, at the same time. Don’t worry about parts of Clojure not immediately related to functional programming. The Project Euler problems do require a bit of math. Don’t worry about lambda calculus, type theory, category theory, monads, morphisms, or any such abstract concerns. The project repository is is available here.
Clojure Testing Framework | Speclj Clojure Scripting - ImageJ Check out clojure web site and particularly the chapter on Java interoperability. Clojure is not a scripting language: Clojure compiles directly to JVM bytecode, and thus runs at native speed. Thus one must think of Clojure as a true alternative to Java the language, but much more expressive, flexible and powerful. See also: Clojure Cookbook. Using Clojure inside Fiji Go to "Plugins - Scripting - Clojure Interpreter". See Scripting Help for details on keybindings and how to use the interpreter. ^ Ctrl+) will add all necessary ending parenthesis. A minimal, complete clojure example: To create scripts, just save them as .clj text files (with an underscore in the name) in any folder or subfolder of Fiji's plugins folder, and run "Plugins - Scripting - Refresh Clojure Scripts" to update the menus (it's done automatically at start up as well). To edit a script, just edit and save it with your favorite text editor. To execute a script, do any of: Select it from the plugins menus. The simplest is: 1.
Tips for Clojure Beginners 1. Learn the essentials with Clojure Koans. Clojure Koans teaches you the basics of the language by providing a series of tests for you to turn green. The topics and tests are chosen well, and the project’s vibe is pleasant (“calling a function is like giving it a hug with parentheses”). Open a koan. 2. 4Clojure is a great way to become familiar with Clojure’s many built-in functions. Make sure to register an account and follow a handful of the Top Users. A word of warning: 4Clojure tends to encourage code golf. For the longer problems, you may prefer to work in your editor. 3. Clojure Programming and The Joy of Clojure are both great places to start. Clojure Programming is approachable, well-written, and no-nonsense. The Joy of Clojure is also excellent, but takes more mental horsepower to get through. 4. As a Rubyist, I’m used to running tests from my editor, and would never adopt a workflow that forced me to switch to the shell to run my tests. Clojurians eschew this separation. 5. 6.
relevance/labrepl Functional programming in Clojure Basic tools Get equipped in your fight against the dragons. Installing the developement environment JavaLeiningenEditorGitHow to submit answers to exercises Training day Get your survival skills up to shape. Structure of the exercise projectUsing the REPLPrefix syntaxDefining functions I am a horse in the land of booleans Get your horse! if and truthinessEverything is an expression and thus has a value Structured data Learn the structural weaknesses of dragons. Local namesData structures VectorsMapsSetsAbstract sequences MappingFiltering Style Polish your boots and armour. IndentationWhitespaceIdioms P-P-P-Pokerface Project: poker hand evaluator Predicates Functions as valuesPredicate functionsHigher-order functions someevery? Recursion Down the rabbit hole. Recursion over sequencesRecursion over numbersNonlinear recursion Tree recursionPassing state Looping is recursion Calling tails. Iteration with tail recursion looprecur One Function to rule them all Accumulating recursion with reduceVariable arguments
Learn Clojure Clojure Notes functional-koans/clojure-koans Clojure Tutorial For the Non-Lisp Programmer | Moxley Stratton I intend to keep this tutorial as accurate and up-to-date as possible. If you have any suggestions for changes, please leave a comment at the bottom of this page. Clojure is a functional lisp dialect that uses the Java Virtual Runtime as its platform. The language home page is at Table of Contents A Quick Comparison In C-like languages, a function call might look something like this: In Clojure, the same function call would look like this: Here, Clojure’s syntax differs in these ways: The opening parenthesis is to the left of the function name.There are no commas delimiting the function parameters.By convention, words in a function name are separated by dashes. There’s not a huge difference. Here’s how adding two values might look in a C-like language: And here’s how it would look in Clojure: In C, the plus operator goes in between the two operands. Installing Clojure A fast and easy way to get started with Clojure is to download and run Clooj. Numbers Booleans Nil Strings Symbols
Mark Volkmann's Clojure Page Mark Volkmann's Page This page contains resources related to the Clojure programming language. Article Change History Sounds Even Jennifer Aniston has quit using other programming languages and now prefers Clojure. Sound Clip #1 Sound Clip #2 Clojure made-simple - John Stevenson Learning Clojure - What should I know about Java and more