clojure tutorial

Both Java locks and CAS have an astonishing overhead (locks call local systems to block threads and cause high overhead ). The actor message queue has its own serious problems (using actor will greatly increase programming complexity ). Therefore, distributed development compromises the optimal solution based on business characteristics. In the case of concurrent writing with fewer reads and more: Clojure STM,Use multi-Version Control to change t

Explore how these next-generation JVM languages handle operator overloading Good ideas in programming languages can be extended and expanded into other languages, just like wine. Therefore, it is not surprising that the Java next-generation languages-groovy, Scala and clojure-have many common features. In this and next installment of the Java Next generation article, I'll explore the consistency of the feature list in each language syntax. I start wi

Macro for supports Loop Next we will continue with the preceding XML example to demonstrate how to use for to traverse the sequence returned by XML-seq. user=> (for [x r] (println "^" x))(^ {:tag :service, :attrs nil, :content [{:tag :mongodb,

Defined"Functional Programming" is a programming paradigm (programming paradigm), that is, how to write a program's methodology. The main idea is to write the operation process as much as possible into a series of nested function calls.For example,

(Defprotocol X (cat [this other])Define a protocol, which is similar to the objective-C protocol. Different from Java interfaces. User => X {: On-interface user. x,: on user. x,: Sigs {: CAT {: Doc nil,: arglists ([this other]),: Name cat }},: var

(FN...) can be used to create anonymous functions, such: User => (FN [x] (+ 2 X) # Accept a parameter X and add 2. The above call defines a function using FN, but it is not executed. If you want to execute it immediately, you can add brackets

This is a created article in which the information may have evolved or changed. Both the Java lock and the CAs are expensive (locks call the local system for thread blocking and wake-up overhead). The actor's message queue also has its own

The previous section describes how noir can easily create a web app. However, in my actual project, only rest API development is required, and the page is handed over to HTML and JavaScript, noir is not required to render the webpage in the

Map functions are quite special. First, let's look at a simple function: user=> (def f (fn [x] (+ 2 x)))#'user/fuser=> (map f [2 4 7])(4 6 9) Define an F function, accept a parameter, and then return the result after + 2. Map accepts two parameters.

The best way to write a configuration file is to use the CLJ file. Next, replace the. xml file with the. CLJ file. The content is as follows: {:mongodb "localhost" :listen_port 7777 :login_timeout 200 :check_timeout 200} A map is defined here. Note

Regular Expression Re-pattern function: The function (re-pattern) accepts a string parameter and returns a regular expression style (java. util. regex. Pattern class instance ). This style can be used for regular expression matching. You can

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Link to the PHP object-oriented programming getting started tutorial, and the OOP Getting Started Tutorial. Link to the PHP object-oriented programming getting started tutorial, the OOP Getting Started Tutorial PHP official learning oop: php. netmanuzhoop5.intro. php the following link Source: blog.snsgou.compost-41.ht