clojure tutorial

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,

Label: style Io color OS ar Java for SP The following content appears in the document on the official website of clojure. This article just summarizes common questions. 1. namespace, Lib, and code file conventions. See the following code: (nscom.my-company.clojure.examples.my-utils(:importjava.util.Date)(:use[clojure.contrib.def:only(defvar-)])(:require[clojure.contrib.shell-out:asshell])) Lib is represented as a Java resource. If you have wr

Of course, a complete web app needs to write logs. Here I use slf4j + logback. First, add two dependencies to the project. CLJ file in the my-website directory: Tools. Logging logback-classic (defproject my-website "0.1.0-SNAPSHOT" :description "FIXME: write this!" :dependencies [[org.clojure/clojure "1.4.0"] [com.novemberain/monger "1.4.1"] [org.clojure/tools.logging "0.2.4"]

"user=> (time (dorun (pmap inc (range 1 1000))))"Elapsed time: 182.349073 msecs" Futures and promises Futures and promises are two slightly more low-level threading constructs, too red by the similar features available in the Java 6 concurrency API. they are simple to understand, simple to use, and provide a very direct way to spawn threads using native clojure syntax.Futures A clojure future represents a

Http://stackoverflow.com/questions/1314732/scala-vs-groovy-vs-clojureGroovy is a dynamically typed language, whose syntax are very close to Java, with a number of syntax improvements that Allo W for lighter code and less boilerplate. It can run through an interpreter as well as being compiled, which makes it good for fast prototyping, scripts, and Learni ng Dynamic languages without has to learn a new syntax (assuming you know Java). As of Groovy 2.0, it also have growing support for static comp

Clojure-jack-in startup Error The error message is as follows: Connecting to swank on port 65280 .. [2 times] Error in process filter: Open-Network-stream: Make client process failed: Connection refused,: Name,Slime lisp,: buffer, nil,: Host, localhost,: Service, 65280,: Nowait, Nil Error in process filter: Make client process failed: Connection refused,: name, slime lisp,: buffer,Nil,: Host, localhost,: Service, 65280,: Nowait, Nil The sol

Now let's take a look atCode: The first one is nil, which has the same null value as Java. Like false, nil can express the condition that the condition is not true. The following is an explanation: Nilnil is a possible value of any data type in clojure. nil has the same value as Java null. the clojure conditional System is based around nil and false, with nil and false representing the values of logi

clojure-basic syntax-function definitionJuly 21:12 PM1. Create function 1.fn anonymous functionExamples are as follows:"hello")#413e8>"hello"))"hello""hello") ; 带参数"hello"user=>The short function can use # (),% to indicate the unique parameter;% 1,%2. Represents the 1th, 2 、.. A parameter;% represents all parameters, as follows:user=> (#(/ % 3) 4)4/3user=> (#(/ % 3) 4);结果为4/34/3user=> (#(/ %2 %1) 3 4);结果为4/34/3user=> (#(apply / %) 3 5 7);结果为3/5/73/35u

The design of the Java language has been purposefully cut to avoid some problems that have been discovered in the previous generation of products. For example, the designers of the Java language feel that multiple inheritance in C + + poses too much complexity, so they choose not to include the attribute. In fact, they rarely build extensibility options in the language, relying only on single inheritance and interfaces. Other languages, including the Java Next generation language, have great po

Software development is now a very hot occupation. From 2014 to 2024, demand for developers in the U.S. job market will grow by 17%, compared with a 7% increase in the average demand for all occupations, according to a statistical data released by the U.S. Labor Bureau. Many young people will choose programming as a starting point for their careers. How to learn programming well? How to become a good programmer? How do you plan for a career as a programmer? is a matter of concern to many young p

Ext.: http://www.linuxidc.com/Linux/2012-10/71557.htmFirst of all, I really have to say that there are many tutorials on the internet like JDK7 installed under Ubuntu. However, most are based on the JDK6 bin file. If you go to the Oracle website now and see it, you will find that it has become a. tar.gz compressed file.In addition this article also incidentally gave clojure download link, filename What of please according to your actual situation chan

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

) Turn off monitoring(Stop Listner)(. Close listener)* * Synchronous Message Queuing with queue implementation(1) Defining Message Queuing(Def sync-q (m/queue "Sync-q")(2) Customizing message answering methods(Def Respinder (M/respond Sync-q Inc)(3) Send a message@ (m/request sync-q 1)Note: The request will wait until the message is answered before it returns, otherwise it remains blocked.* * Implementing asynchronous messages with topic(1) Definition topic(Def t (m/topic "test-topic"))(2) post

Common Methods for clojure map data structure: Map sorting (Println (sorted-map-by> 1 "a", 2 "B", 3 "c"); {3 c, 2 B, 1 };; take one equal value (let [results {: A 1: B 2: C 2: D 5: E 1: F 1}] (println (into (sorted-map-by (fn [key1 key2] (compare (get results key2) (get results key1 )))) results); {: D 5,: C 2,: A 1}; all unequal values (let [results {: A 1: B 2: F 4: E 3: D 6: C 5}] (println (into (sorted-map-by (fn [key1 key2] (compare (get result

This article by larrylgq prepared, reproduced please note the Source: http://blog.csdn.net/larrylgq/article/details/7395261 Author: Lu guiqiang Email: larry.lv.word@gmail.com Lisp uses special operators to extend the syntax, but the number of special operators in lisp is fixed. To solve this problem, LISP introduces macros, which do not directly do things, but generate actual services.Code. Evaluate a macro: If the received S-expression is a parameter, a lisp expansion (ecpansion)

Using existing plug-ins, it is convenient to add the gzip function to clojure.1. Add the dependency on BK/ring-gzip plug-in project. CLJ.: Dependencies [BK/ring-gzip "0.1.1"]2. Add references to the handle file.(: Use your ring.middleware.gzip])3. Add wrap-gzip to the app.(DEF app(-> (Routes app-routes)(Handler/site)(Wrap-base-URL)(Wrap-gzip ))The final compression effect is also obvious.Before compression:After compression: The compression ratio is

Talk about my own background, I am a dabbler programmer, do anything like to know more and try again, I have been exposed to many languages, most of them as tools to useMost of my work now lies in data mining and machine learning, and web development, and the first language I've worked with is Python, where I learned about the concept of functional programming.Speaking of Lisp is said to be a copy of Lisp Python, and learned that the language is from the hacker and painter This book, is said to

4Clojure: 4Clojure Longest ascending sub-sequence algorithmThe description is as follows: Given a vector of integers, find the longest consecutive sub-sequence of increasing numbers. If the sub-sequences has the same length, use the one of that occurs first. An increasing sub-sequence must has a length of 2 or greater to qualify. Cases:[1 0 1 2 3 0 4 5] The longest ascending subsequence sequence is [0 1 2 3][5 6 1 3 2 7] The longest ascending subsequence sequence is [5 6] (DEFN t

Common macro infix macro to parse a person's arithmetic writing format and execute(Defmacro infix "Use this macro if you pine for the notation of your childhood" [infixed] (list (second INFI Xed) (first infixed) (last infixed)))So use:(infix (1 + 1)); = 2Check the returned list with MacroexpandIn the above example, the process of removing the last symbol, and then evaluating the remaining list, is actually passed.(+ 1 2), 3 (+ 1 2)To know the list before the final evaluation result comes out,

Recently to go home, need to collate the data, there are a lot of books on the computer, classified in their respective directories, to tidy up is quite troublesome, lazy is one of the great characteristics of human progress, with Clojure to complete this task.After writing the effect is good, complete this work only with less than 20 lines of code, because I am a novice, should also be able to write more concise, pure when practiced hand. The code is