Tag: Clojure

Question 1. What Is Clojure?

Answer :

Clojure is a Lisp family language, open source, dynamic type system and general purpose programming language developed for the Java Virtual Machine (JVM) and created by Rich Hickey.

Clojure is a compiled language.

Clojure is a dialect of Lisp and a powerful macro system.

Clojure is a wonderfully simple language and I hope you love it.

Question 2. Why Clojure?

Answer :

Clojure is open source, dynamic type system and general purpose programming language.

Question 3. What Are The Languages Fundamentals?

Answer :

• Clojure is based on Lisp and general purpose programming language.
• Clojure is functional programming language
• Clojure is dynamic type system
• Clojure is runs on the JVM
• Clojure is open source

Question 4. How To Run Clojure?

Answer :

Local build –

git clone https://github.com/clojure/clojure.git

cd clojure

./antsetup.sh

ant local

Then start the REPL with the local jar –

java -jar clojure.jar

Try Clojure online – Provides a browser based Clojure repl for interactive exploration.

Question 5. How Do I Create A Clojure Project?

Answer :

You can use Leiningen to generate the scaffolding of a new Clojure application-

lein new app project_name

Generating a project called “project-name” and it’s based on the “app” template.

Question 6. Does It Have A Build Automation System?

Answer :

It helps developers to scaffold new projects, resolve dependencies, run tests, etc.

Question 7. How To Create Your First Project?

Answer :

Create your first Clojure program and looks like-

lein new app my-proj

cd my-proj

# Have a look at the “-main” function in src/my proj/core.clj.

lein run

Question 8. What Versions Of Java Have Been Tested?

Answer :

Clojure 1.0 and 1.1 are both routinely used by many people on various versions of:

Sun’s JRE 1.5.0 and 1.6.0

OpenJDK 1.5.0 and 1.6.0

IBM J9

It is also known to run on:

JamVM with Classpath

Question 9. What Versions Of Java Are Supported?

Answer :

Clojure currently targets Java 5 (and later versions).

Question 10. Where Does Swank-clojure (slime) Look For Clojure’s Jars?

Answer :

When you start it with M-x slime, it will add all jars under check ~/.clojure and ~/.swank-clojure to your classpath. You will need at least clojure.jar, clojure-contrib.jar and swank-clojure.jar. You can download pre-built Clojure and Contrib jars from build.clojure.org and swank-clojure.jar from Clojars.

Question 11. How Do I Fetch Web Pages And Make Http Requests?

Answer :

For the simple case of GETing a document into a string you can simply pass a URL to clojure.contrib.duck-streams/slurp*:

(use ‘clojure.contrib.duck-streams)

(slurp*  “http://www.example.org/”)

;; ⇒ “rnrn 

For more advanced usage, including other request types like POST you may find the clojure-http-client library useful. Finally you can of course use (.openConnection) on a Java URL object directly.