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Short Tour Of Clojure
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Tamizhvendan S
May 23, 2020
Programming
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Short Tour Of Clojure
Tamizhvendan S
May 23, 2020
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Transcript
Lead Consultant www.ajira.tech Tamizhvendan S Passionate, Pragmatic and Polyglot Programmer
https://www.demystifyfp.com tamizhvendan (short-tour (of (clojure)))
Credits: https://twitter.com/andreasdotorg/status/570190592610832384
None
None
Credits: https://github.com/tallesl/Rich-Hickey-fanclub Simple Made Easy Hammock Driven Development The Value
of Values Effective Programs
Credits: https://www.artsy.net/artwork/brian-kernighan-hello-world
Hello World in three languages printf("Hello, World!\n"); C System.out.println("Hello, World");
Java println("Hello, World") Scala
Hello World Requirements 1. A String Representation 2. Function/Method
function (argument) Function/Method Invocation
function (argument) Clojure’s way! (function argument)
Hello World in Clojure (println "Hello, World!")
(println "Hello, World!") function argument whitespace Clojure Syntax
Functions with multiple arguments printf("hello, %s\n", "World!"); C System.out.printf("Hello, %s\n",
"World!"); Java printf("Hello, %s\n", "World!") Scala
function (argument1, argument2) Function/Method Invocation
(function argument1, argument2) Clojure’s way! function (argument1, argument2)
(function argument1, argument2) (function argument1 argument2) optional Clojure’s way!
(function argument1 argument2 argument3 …) Clojure’s way!
Consistent Syntax 1. Adding the numbers one, two, three &
four 2. Converting an integer to a string 3. Concatenating two strings 4. Conditional Operator
Adding the numbers one, two, three & four 1 +
2 + 3 + 4 Converting an integer to a string String.valueOf(1) Concatenating two strings "Hello, ".concat("World!")
1 + 2 + 3 + 4 function function function
argument1 argument2 argument3 argument4 Infix Notation
method String.valueOf(1) ClassName argument invoke function Prefix Notation
method "Hello, ".concat("World!") Object argument invoke function Prefix Notation
argument2 true ? "truthy" : "falsy" argument1 separator function argument3
Conditional Operator
function argument2 argument4 argument1 argument3 (+ 1 2 3 4)
Clojure Syntax 1 + 2 + 3 + 4
(String/valueOf 1) function argument1 class name static method argument(s) to
the static method Clojure Syntax String.valueOf(1)
(. "Hello, " concat "World!") function argument1 argument2 argument3 instance
instance method argument(s) to the instance method special form Clojure Syntax "Hello, ".concat("World!")
(if true "truthy" "falsy") function argument1 argument2 argument3 boolean value
value1 value2 special form Clojure Syntax true ? "truthy" : "falsy"
Clojure Syntax
Clojure Form A structure that the Clojure compiler recognise.
Types of Clojure Forms Atomic Data Type - Literals "Hello,
World" 1 1.2 true nil \a :keyword symbol false
Types of Clojure Forms Collection - Literals [1 "2" 3]
'(1 1.2 1.5) {:one 1 :two 2 :three 3} #{1 2 3}
Types of Clojure Forms Expressions (function invocation) (println "Hello, World!")
(println "Hello," "World!") (+ 1 2 3 4) (String/valueOf 1) (. "Hello, " concat "World!")
Literals evaluate to itself user!=> "Hello, World" "Hello, World" user!=>
1 1
Expression always return a value user!=> (println "Hello, Clojure!") Hello,
Clojure! nil output of println function return value of println function
Forms can be nested (println "1 + 1 =" (+
1 1))
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) left to right
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) An expression begins with “(“
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) function symbol println is a variadic function defined in the clojure.core namespace.
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) argument1 string literal literals evaluate to itself
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) An expression begins with “(“ argument2
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) function symbol + is a variadic function defined in the clojure.core namespace.
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) argument1 integer literal literals evaluate to itself
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) argument2 integer literal literals evaluate to itself
Clojure Evaluation Model (println "1 + 1 =" (+ 1
1)) An expression ends with “)“
Clojure Evaluation Model (println "1 + 1 =" 2) All
expressions return a value
Clojure Evaluation Model (println "1 + 1 =" 2) An
expression ends with “)“
Clojure Evaluation Model (println "1 + 1 =" 2) user!=>
(println "1 + 1 =" (+ 1 1)) 1 + 1 = 2 nil output of println function return value of println function
Clojure Evaluation Model Deviations Special Forms if . def let
quote var fn loop recur Macros when condp -> ->> Macros are programs that write programs! try do
Summary f(x) translates to (f x) f(x, y) translates to
(f x y) o.m(x) translates to (. o m x) 1 + 2 + 3 + 4 translates to (+ 1 2 3 4) Prefix Notation
Demo!
Let’s start!