clojure for beginners

No matter what development environment is used, you must first familiarize yourself with the basic command line usage methods. Reference from the official site: http://clojure.org/downloads First, make sure that JDK 5 or later is installed. Then download the release package for clojure1.4: http://repo1.maven.org/maven2/org/clojure/clojure/1.4.0/clojure-1.4.0.zi

The let parameter decomposition of clojure is clearly described in this document. For example (let[[abcd:ase][1234567]][abcde])->[123(4567)[1234567]] This let can be used as a value assignment in other languages. For example, the int I = 0 in Java also supports multi-variable assignment. For example, Perl's my ($ A $ B) = @ A (I don't know if it's right, that's what it means ). However, clojure changes

1. https://github.com/clojure-emacs/cider#keyboard-shortcuts2. Install Emacs 24.53. http://clojure-doc.org/articles/tutorials/emacs.html4. http://stackoverflow.com/questions/23233470/how-to-use-ciders-built-in-autocompletion-in-clojure/28249313#282493135. Edit. Lein PROJECT.CLJ　　{: User{:java-cmd "C:\\Program Files\\java\\jdk1.8.0\\bin\\java.exe":p lugins [[Cider

In a previous e-mail, I pointed out that among the many changes, the most obvious is that the development of using other popular languages on the JVM on the Java domain has become more and more rapid. Some old and new-created JVM-based languages---JRuby and Jython, Java-style languages---Groovy and Scala and brand, new languages---Clojure and Kotlin, These languages give us a choice------get the performance and reliability of the JVM but can use a dif

Code Path:https://github.com/bluesilence/Lisp/blob/master/clojure/projects/room-escape/.Data ModelBased on the draft, the data models can be built of 4 major units:1. StoryIt ' s the base unit of a Room-escape story. The Storyhas following members:1) name:the name of this guest, shown in the Room-selection menu2) description:the Description of this guest, shown in the Room-selection menu3) starting-message:the starting message when player begins to pl

A few years ago, I had time to pay attention to clojure, which focuses on lisp and its concurrent solutions. for the latter, the old hacker recommended a good article: "software transactional memory ". this article is a good starting point. On the one hand, you can learn clojure. On the other hand, you can take this opportunity to review chapter 12th of "programming language-the path to practice" and "concu

DO and block statementsIn Scala, statements enclosed in curly braces {} form a block, and its value is the value of the last statement.Scala> val a = { | println ("a") | 1}aa:int = 1{println ("a"); 1} has a value of 1.In Clojure, it is sometimes necessary to make multiple form blocks, and the value of this block is the value of the last form. Just use doUser=> (Def A (Do (println "a") 1)) a# ' user/auser=> A1 Do takes any number of fo

Corresponding to stdin, stdout, and stderr, clojure provide three symbols by default: * In *, * out *, and * err. You can use the binding macro to perform redirection. For example, the following example redirects * out * to a file: user=> (binding [*out* (java.io.FileWriter. "/home/chenshu/tt")] (println "Write to tt.") (flush))nil Statements originally output to the console are now written to the TT file. Note that (flush) is used to write data in

In Clojure, almost everything is a value.State is the value of an identity at a point in time.For identity, four types of references are available in Clojure. Refs, making changes to the shared state in a coordinated,synchronous manner Atoms, changing the shared state in uncoordinated,synchronous mode Agents, changing the shared state in asynchronous mode Vars, manages thread local stat

1 in Eclipse Marketplace all Clojure will see this counterclockwise plugin, directly click Install2 Create a Project setup jdk (I have 2 versions of the JDK on this machine, one 1.6 and 1.8 by default is 1.6) using 1.83 run Clojure, if you find that the JDK running Clojure is inconsistent with the JDK you set up, please check compile if no problemSo is the Lein p

Create a new Clojure project in Eclipse clj01Clojure operation MySQL relies on the Mysql-connector-java, Clojure-contrib and JAVA.JDBC three jar packages.PROJECT.CLJ configuration information is as follows: Configuration is complete: dependencies save, the system will automatically download the configured jar package information.(Defproject clj01"0.1.0-snapshot":d escription"fixme:write Description": URL"Ht

Symbol writing method: 1. It cannot start with a number. 2. It can be followed by text or numbers and *, + ,!, -,_,? 3./is a special character. It can only appear once in symbol. Generally, namespace is on the left. For example, my-namespace/Foo. 4 .. It is also a special character and can appear in symbol multiple times. For example, java. util. bitset. 5.: It can be used in symbol multiple times, but it cannot be continuous. 6. the symbol at the beginning or end is the symbol used by

A few days ago, I saw a blog about my thinking. In addition, I have a slight feeling of learning clojure: In the blog we read, we asked the readers to divide the cows, grass, and fish into two types. We compared two different ways of thinking: 1 ). associated thinking: Divide cows and grasses into one type, because cows graze; 2 ). object thinking: It classifies cows and fish as one type, because both are animals. Later, when preparing to learn the

Brief introductionUsing Clojure to encapsulate the use of Graphviz, the main implementation of UML is currently drawingUseTake the UML of command mode as an example to demonstrate the use of CdrawInstalling GraphvizCdraw is a simple package for Graphviz, please first install the GraphvizAdd dependency Create a new Clojure project using Leiningen UML Add the following dependencies in the PROJECT

Code Path:Https://github.com/bluesilence/Lisp/blob/master/clojure/projects/room-escape/src/room_escape/script.cljExtract Stories to TXTIn order to move the stories from. Clj into. txt, I leveraged Clojure ' s eval function. The steps is as follows:1. Read the contents from the story ' s txt as string;2. Eval each key-value pair of each hostel;3. Sort the rooms by name.This works, but isn't good enough. Beca

Clojure (Ns r2.test2(: Gen-class: Methods [# ^ {: static true} [getMessage [String])) (Defn-getMessage [name](Println (str ("hello" name "! ")))) JAVA end Import com. ociweb. clj. Demo; // class created by compiling Clojure source file Public class Main { Public static void main (String [] args ){String message = Demo. getMessage ("Mark ");System. out. println (message );}} It seems that you can only use it

Learn how Java next-generation languages reduce boilerplate code and reduce complexity The limitations faced by the Java programming language at birth are different from those faced by today's developers. Specifically, there are primitive types in the Java language due to the performance and memory limitations of hardware in the middle of the 90 's. Since then, the Java language has evolved, with automatic boxing (Autobox) eliminates a lot of hassle, and the next language (Groovy, Scala, and

The core role of microBecause the micro receive parameters can be very complex, and do not evaluate, so you can receive list, in the internal conversion, after processing execution, you can also receive a completely non-Lisp syntax, internally converted to Clojure can execute the list.This allows you to create your own DSL and implement the Clojure macro as a DSL parser.The difference between micro and func

Clojure provides several powerful data structures (collections)I. Types of collections1. VectorEquivalent to an array such as: [2 3 5], ["Ad" "Adas" "Adadsads"]2. ListEquivalent to a linked list, such as: ' (2 3 5), ' ("Ad" "Adas" "Adadsads")Compared to vectors, [] becomes (), and because () the symbol is used for function calls, in order to differentiate, it needs to be preceded by a single quotation mark '3. MapSyntax format such as: {: a 1:b 1}Map

Clojure provides an operation form other than functions and macros. Special form is a limited number and is not implemented by clojure itself. It mainly includes the following: Catch, def, do, dot ('.'), finally, FN, if, let, loop, Monitor-enter, monitor-exit, new, quote, recur, set !, Throw, try, and var. Complete documentation see: http://clojure.org/special_forms Vars should be explained here. First,