![(let*
[G__360
(HttpServer/create
address
0)]
(.createContext
G__360
path
handler)
(.setExecutor
G__360
nil)
(.start
G__360)
G__360)
(doto
(HttpServer/create
address
0)
(.createContext
path
handler)
(.setExecutor
nil)
(.start))](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-20-2048.jpg?cb=1669761734)
![List<Integer>
numbers
=
Arrays.asList(1,
3,
4,
8,
2);
Collections.sort(numbers,
new
Comparator<Integer>()
{
@Override
public
int
compare(Integer
o1,
Integer
o2)
{
return
o2.compareTo(o1);
}
});
(doto
(ArrayList.
[1
3
4
8
2])
(Collections/sort
(fn
[o1
o2]
(.compareTo
o2
o1))))
List<Integer>
numbers
=
Arrays.asList(1,
3,
4,
8,
2);
Collections.sort(numbers,
(o1,
o2)
-‐>
o2.compareTo(o1));](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-40-2048.jpg?cb=1669761734)
![List<Integer>
numbers
=
Arrays.asList(1,
3,
4,
8,
2);
Collections.sort(numbers,
new
Comparator<Integer>()
{
@Override
public
int
compare(Integer
o1,
Integer
o2)
{
return
o2.compareTo(o1);
}
});
(doto
(ArrayList.
[1
3
4
8
2])
(Collections/sort
(fn
[o1
o2]
(.compareTo
o2
o1))))
(sort
#(compare
%2
%1)
[1
3
4
8
2])
List<Integer>
numbers
=
Arrays.asList(1,
3,
4,
8,
2);
Collections.sort(numbers,
(o1,
o2)
-‐>
o2.compareTo(o1));](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-41-2048.jpg?cb=1669761734)
![(defn
len-‐reflected
[s]
(.length
s))
(defn
len-‐hinted
^String
[^String
s]
(.length
s))
user=>
(time
(dotimes
[i
1000000]
(len-‐reflected
(str
i))))
"Elapsed
time:
3204.913
msecs"
nil
user=>
(time
(dotimes
[i
1000000]
(len-‐hinted
(str
i))))
"Elapsed
time:
113.317
msecs"
nil](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-43-2048.jpg?cb=1669761734)
![Polyglot projects
with Leiningen
(defproject
clojure-‐java
"1.0.0-‐SNAPSHOT"
:description
"Example
Clojure+Java
project."
:min-‐lein-‐version
"2.0.0"
:source-‐paths
["src/clojure"]
:java-‐source-‐paths
["src/java"]
:javac-‐options
["-‐target"
"1.5"
"-‐source"
"1.5"])
http://leiningen.org](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-44-2048.jpg?cb=1669761734)
![(defmacro
doto
[x
&
forms]
(let
[gx
(gensym)]
`(let
[~gx
~x]
~@(map
(fn
[f]
(if
(seq?
f)
`(~(first
f)
~gx
~@(next
f))
`(~f
~gx)))
forms)
~gx)))](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-47-2048.jpg?cb=1669761734)
![(ns
foo.core
(:gen-‐class))
(defn
-‐main
"I
don't
do
a
whole
lot
...
yet."
[&
args]
(println
"I'm
a
little
pony"))
foo$
lein
run
I'm
a
little
pony](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-48-2048.jpg?cb=1669761734)
![(defn
make-‐example
[]
(proxy
[Object]
[]
(toString
[]
"I'm
a
little
pony")))
user=>
(.toString
(make-‐some-‐example))
"I'm
a
little
pony"](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-49-2048.jpg?cb=1669761734)
![class
Example
{
void
someMethod(String
x)
{
someMethod(x,
null)
}
void
someMethod(String
x,
String
y)
{
doSomethingWith(x,
y);
}
}
(proxy
[Example]
[]
(toString
([x]
(proxy-‐super
someMethod
x))
([x
y]
(do-‐other-‐stuff
this
x
y))))](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-50-2048.jpg?cb=1669761734)
![(let
[^LoadingCache
cache
(doto
CacheBuilder/newBuilder
(.maximumSize
1000)
(.build
(reify
CacheLoader
(load
^Graph
[^Key
key]
(create-‐expensive-‐graph
key)))))])
LoadingCache<Key,
Graph>
cache
=
CacheBuilder.newBuilder()
.maximumSize(1000)
.build(new
CacheLoader<Key,
Graph>()
{
public
Graph
load(Key
key)
{
return
createExpensiveGraph(key);
}
});
LoadingCache<Key,
Graph>
cache
=
CacheBuilder.newBuilder()
.maximumSize(1000)
.build((key)
-‐>
createExpensiveGraph(key));](https://image.slidesharecdn.com/refactoringtomacroswithclojure-1-130503072625-phpapp02/75/refactoring-to-macros-with-clojure-51-2048.jpg?cb=1669761734)
Refactoring to Macros with Clojure
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Refactoring to Macros with Clojure
- 1. Refactoring to Macros with Clojure Dimitry Solovyov @dimituri
- 2. Let's talk about FUNCTIONAL PROGRAMMING
- 4. liftIO $ atomicModifyIORef sc $ n -‐> (n + 1, ()) d <-‐ f v >>: onInner liftIO $ ds `addDisposable` d
- 8. >>:
- 10. LISP in 3 minutes via @bodiltv
- 14. Clojure It's a Lisp Compiled Dynamic types Type hints Macros
- 15. Clojure It's a Lisp Compiled Dynamic types Type hints Macros Optional static types Optional Prolog
- 17. HttpServer server = HttpServer.create(address, 0); server.createContext(path, handler); server.setExecutor(null); server.start();
- 18. HttpServer server = HttpServer.create(address, 0); server.createContext(path, handler); server.setExecutor(null); server.start(); (doto (HttpServer/create address 0) (.createContext path handler) (.setExecutor nil) (.start))
- 19. macro |ˈmakrəәʊ| noun ( pl. macros ) 1 (also macro instruction) Computing a single instruction that expands automatically into a set of instructions to perform a particular task.
- 20. (let* [G__360 (HttpServer/create address 0)] (.createContext G__360 path handler) (.setExecutor G__360 nil) (.start G__360) G__360) (doto (HttpServer/create address 0) (.createContext path handler) (.setExecutor nil) (.start))
- 21. 根性
- 23. String url = Encoding.decodeBase64(b); String decodedUrl = Encoding.decodeUrl(url); String encodedUrl = Encoding.encodeBase64(decodedUrl); System.out.println(encodedUrl);
- 24. String url = Encoding.decodeBase64(b); String decodedUrl = Encoding.decodeUrl(url); String encodedUrl = Encoding.encodeBase64(decodedUrl); System.out.println(encodedUrl); (-‐> b Encoding/decodeBase64 Encoding/decodeUrl Encoding/encodeBase64 println)
- 25. -‐> (-‐> stuff (foo ,,, a) (bar ,,, b c d) (baz ,,, e f))
- 26. -‐>>-‐> (-‐> stuff (foo ,,, a) (bar ,,, b c d) (baz ,,, e f)) (-‐>> stuff (foo a ,,,) (bar b c d ,,,) (baz e f ,,,))
- 27. -‐<>-‐>>-‐> (-‐> stuff (foo ,,, a) (bar ,,, b c d) (baz ,,, e f)) (-‐>> stuff (foo a ,,,) (bar b c d ,,,) (baz e f ,,,)) (-‐<> stuff (foo a <>) (bar b c <> d) (baz <> e f))
- 28. “Swiss Arrows” -‐<>> -‐?<> -‐!> -‐!>> -‐!<> <<-‐ -‐< -‐<:p -‐<< -‐<<:p -‐<>< -‐<><:p https://github.com/rplevy/swiss-arrows
- 29. -‐<<:p
- 30. -‐<<:p
- 31. Q: How do I get the result from a chain of computatoins that may fail?
- 32. PhoneNumber number = phoneMap.get(person); if (number != null) { Carrier carrier = carrierMap.get(number); if (carrier != null) { return addressMap.get(address); } } return null;
- 33. WHAT YOU'RE LOOKING FOR IS AN OPTION MONAD
- 35. PhoneNumber number = phoneMap.get(person); if (number != null) { Carrier carrier = carrierMap.get(number); if (carrier != null) { return addressMap.get(address); } } return null; (some-‐>> (.get phoneMap person) (.get carrierMap) (.get addressMap))
- 37. All Clojure functions implement java.util.Comparator java.lang.Runnable java.util.concurrent.Callable
- 38. List<Integer> numbers = Arrays.asList(1, 3, 4, 8, 2); Collections.sort(numbers, new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { return o2.compareTo(o1); } });
- 39. List<Integer> numbers = Arrays.asList(1, 3, 4, 8, 2); Collections.sort(numbers, new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { return o2.compareTo(o1); } }); List<Integer> numbers = Arrays.asList(1, 3, 4, 8, 2); Collections.sort(numbers, (o1, o2) -‐> o2.compareTo(o1));
- 40. List<Integer> numbers = Arrays.asList(1, 3, 4, 8, 2); Collections.sort(numbers, new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { return o2.compareTo(o1); } }); (doto (ArrayList. [1 3 4 8 2]) (Collections/sort (fn [o1 o2] (.compareTo o2 o1)))) List<Integer> numbers = Arrays.asList(1, 3, 4, 8, 2); Collections.sort(numbers, (o1, o2) -‐> o2.compareTo(o1));
- 41. List<Integer> numbers = Arrays.asList(1, 3, 4, 8, 2); Collections.sort(numbers, new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { return o2.compareTo(o1); } }); (doto (ArrayList. [1 3 4 8 2]) (Collections/sort (fn [o1 o2] (.compareTo o2 o1)))) (sort #(compare %2 %1) [1 3 4 8 2]) List<Integer> numbers = Arrays.asList(1, 3, 4, 8, 2); Collections.sort(numbers, (o1, o2) -‐> o2.compareTo(o1));
- 43. (defn len-‐reflected [s] (.length s)) (defn len-‐hinted ^String [^String s] (.length s)) user=> (time (dotimes [i 1000000] (len-‐reflected (str i)))) "Elapsed time: 3204.913 msecs" nil user=> (time (dotimes [i 1000000] (len-‐hinted (str i)))) "Elapsed time: 113.317 msecs" nil
- 44. Polyglot projects with Leiningen (defproject clojure-‐java "1.0.0-‐SNAPSHOT" :description "Example Clojure+Java project." :min-‐lein-‐version "2.0.0" :source-‐paths ["src/clojure"] :java-‐source-‐paths ["src/java"] :javac-‐options ["-‐target" "1.5" "-‐source" "1.5"]) http://leiningen.org
- 45. http://www.ldn.lv Workshop: Clojure Saturday, May 18, 2013 10:00 am Citadeles iela 12, Riga http://riga.techhub.com/
- 47. (defmacro doto [x & forms] (let [gx (gensym)] `(let [~gx ~x] ~@(map (fn [f] (if (seq? f) `(~(first f) ~gx ~@(next f)) `(~f ~gx))) forms) ~gx)))
- 48. (ns foo.core (:gen-‐class)) (defn -‐main "I don't do a whole lot ... yet." [& args] (println "I'm a little pony")) foo$ lein run I'm a little pony
- 49. (defn make-‐example [] (proxy [Object] [] (toString [] "I'm a little pony"))) user=> (.toString (make-‐some-‐example)) "I'm a little pony"
- 50. class Example { void someMethod(String x) { someMethod(x, null) } void someMethod(String x, String y) { doSomethingWith(x, y); } } (proxy [Example] [] (toString ([x] (proxy-‐super someMethod x)) ([x y] (do-‐other-‐stuff this x y))))
- 51. (let [^LoadingCache cache (doto CacheBuilder/newBuilder (.maximumSize 1000) (.build (reify CacheLoader (load ^Graph [^Key key] (create-‐expensive-‐graph key)))))]) LoadingCache<Key, Graph> cache = CacheBuilder.newBuilder() .maximumSize(1000) .build(new CacheLoader<Key, Graph>() { public Graph load(Key key) { return createExpensiveGraph(key); } }); LoadingCache<Key, Graph> cache = CacheBuilder.newBuilder() .maximumSize(1000) .build((key) -‐> createExpensiveGraph(key));