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Programming Lisp Clojure - 2장 : 클로저 둘러보기
1.
Programming Lisp
Clojure 2 : : : ( )
2.
(
) :
3.
.
. ( ()) .
4.
(Reader) -
. (Reader Macro) - . - .
5.
#(body %)
(fn [params*] body) ; deref @form (deref form) meta ^form (meta form) meda data meat data #^metadata form ‘form (quote form) form #”foo” => a java.util.regex.Pattern `x ~ ~@ var-quote #’x (var x)
6.
(boolean) / nil
true, false (character) a (keyword) :tag, :doc (map) {:name “Bill”, :age 42} (number) 1, 4.2 (string) “hello” (symbol) user/foo, java.lang.String
7.
(symbol)
. - - ( ) - - : /( ), .( ) - (ref) - .
8.
(number) -
. - BigDecimal( M), BigInteger . - BigDecimal . - . - : +, -, /, *, >, >=, <, = - : quot( ), rem( ) - 42 => 42 - [1 2 3] => [1 2 3] - (/ 22 7) => 22/7 - (/ 22.0 7) => 3.142857142857143 - (+) => 0 - (+ 1 (/ 0.00001M 1000000000000000000) ) => 1.00000000000000000000001M
9.
(boolean) / nil
. - ture, 0, () = - false, nil = - nil false . - nil/false ( list = ()/0 = zero) true . - : . (?) . ture . - (true? true) => true - (false? “foo”) => false - (zero? 0.0) => true - (nil? nil) => true - (if () “In Clojure” “in Common Lisp”) => “In Clojlure” - (if 0 “Zero” “NonZero”) => “Zero”
10.
(character)
. - , ( ) . - (backspace), (formfeed, ), (newline), (return), (space), (tab) . - - . - str : ( ) toString nil . - (str ) => - (str space ) => - (str backspace formfeed newline newline tab ) => b f n n t
11.
(string)
. - . - . - (“”) - . - interleave : . - apply str : interleave . . - take-nth :1 , . - (str 1 2 nil 3) => “123” - (apply str (take-nth 3 (apply str (interleave "Attack midnight" "The pur" "None")))) => “Atta”
12.
(map) /
. (hash-code) . - {} . -{ } . - def : , . - get : . . - (def names {“ ”“ ”}) => #‘user /names - (get names “ ”) => “ ” - (get names “ ”“ ”) => “ ”
13.
(keyword)
. - . - (:) . - defstruct : ( ) . - struct : . - struct-map : ( ) . - (def nations {: “ ”} => #‘user/nations - (nations : ) (: nations) => “ ” - (defstruct names : ) => #‘user/names - (struct names “ ”) => {: " "} - (struct-map names : “ ”) => {: " "}
14.
. -
. - (defn [ ...] ) : . & . - #( %1, %2 ... ) (fn [ ] ) : . - (defn get “return” [user] (str “Hello, “ user) (get “world”) => “Hello, world” - (defn get [hello] (fn [user] (str get “,” user))) (defn get2 (get “Hello”) (get2 “world” => “Hello, world”)
15.
. - (def
defn var ) : var .( .) - (var ) #’ : var . - (let [ ... ] ): .
16.
:
(name space) . - => - (resolve ): . - (in-ns ): . - (import ‘( )) : . . - (require ‘ ): . - (use ‘ ): . - (use :reload ‘ ): . - (use :reload-all ‘ ): . - (ns ): , :import, :require, :use . - (in-us ‘newworld) => newworld=>
17.
. -
( ) . - {: } - (with-mata ): . - (identical? 1 2 ): . - (meta ) ^ : . - (assoc ....) : .
18.
.(
) - var . - #^
19.
:
if / do loop / recur for
20.
if
. - . - (if ( ) ) - (if (< 50 0) "yes" "no") => “no” - when / when-not :
21.
do
. - (do ....) - (if (< 50 0) (do (println "haha") "yes") (do (println " ") (println "haha") "no")) => | haha | "no"
22.
loop / recur
. - loop : let recur . - recur : loop . - (loop [ ...] ) - (recur ...) - (loop [n [] x 5] (if (zero? x) (println n) (recur (conj n x) (- x 1)))) => [5 4 3 2 1] | nil
23.
for
. - (for [ ...] ) - (for [file "ABC"] (format "%c" file)) => ("A" "B" "C")
24.
(boolean) / nil
true, false (character) a (keyword) :tag, :doc (map) {:name “Bill”, :age 42} (number) 1, 4.2 (string) “hello” (symbol) user/foo, java.lang.String
25.
: if / (form?)
/ do loop / recur for
26.
QnA