Pivorak Clojure by Dmytro Bignyak

Nov 25, 20160 likes344 views

(1) Clojure is a functional programming language that uses parentheses syntax and runs on the JVM; (2) It has features like immutability, concurrency constructs like atoms and agents, and support for functional programming patterns; (3) Clojure can be used for both functional programming and object-oriented programming with records, and has tools for metaprogramming, async programming with core.async, and compiling to JavaScript with ClojureScript.

Clojure ))))
How not to be afraid of parentheses
Dmytro Bignyak

Me
Dmytro Bignyak
GitHub: deril
Twitter: @derilok

It is not about
• in Ruby it takes 5 lines of code but in Clojure only 4
• I show you much code, how cool Clojure is

Is that easy?
(defn select
"Returns a set of the elements for which pred is true"
{:added "1.0"}
[pred xset]
(reduce (fn [s k] (if (pred k) s (disj s k)))
xset xset))

• It is a functional language
• It has functional advantages

• Clojure can used as functional style
(map (partial * 10) [1 2 3]) ; => [10 20 30]
• It also can be used for structures
(defrecord Color [red green blue])
(def b (assoc a :alpha 0.1))
; b => {:alpha 0.1, :red 0.5 :green 0.6, :blue 0.7}

Clojure is very useful
when you want some
ASYNC

Clojure has 4 types of links
1. var (thread local)
2. atom (can be synchronically changed, but not
coordinately)
3. agent (async state; analogue actor)
4. ref (can be synchronically and coordinately
changed)

atom
(let [x (atom 0)]
(println @x) ; => 0
(swap! x inc)
(println @x)) ; => 1

agent
(def a (agent 0)) ; initial state
(send a inc)
(println @a) ; => 1
(send a (fn [x] (Thread/sleep 100) (inc x)))
(println @a) ; => 1
; in 100ms
(println @a) ; => 2

• Agents change their state asynchronically
• In any time you can call deref and get the state of
agent

Clojure can be used for MVCC
(Multiversion Concurrency Control)
(def account1 (ref 100)
(def account2 (ref 0))
(dosync
(alter account1 - 30)
(alter account2 + 30))
(println @account1) ; => 70
(println @account2) ; => 30
(dosync
(alter account1 * 0)
(alter account2 / 0)) ; => ArithmeticException
; values weren’t changed
(println @account1) ; => 70
(println @account2) ; => 30

Example core.async
(defonce log-chan (chan))
(defn loop-worker [msg]
(println msg))
(go-loop []
(let [msg (<! log-chan)]
(loop-worker msg)
(recur)))

Clojure (as all Lisps) is very
powerful in metaprogramming
(defmacro unless [pred a b]
`(if (not ~pred)
~a
~b))
(unless (> 1 10)
(println "1 > 10. ok")
(println "1 < 10. wat"))

Language is nothing
without infrastructure

• Clojure uses JVM
• Eclipse, IDEA plugins
• Leiningen building tool
• Web frameworks (LuminusWeb, Noir)
• Async servers (https://github.com/ztellman/aleph)

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