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Scala map&tuple
1.
Scala Map & Tuple Yuk
SeungChan 13년 7월 27일 토요일
2.
Agenda • Map • Tuple •
Zipping 13년 7월 27일 토요일
3.
Map • Map • create,
get, update • iterate 13년 7월 27일 토요일
4.
Map •Mutable
5.
Map •import
6.
scala.collection.mutable.Map •Immutable
7.
Map •import
8.
scala.collection.immutable.Map •“쌍”의
9.
모음 •Key와
10.
11.
Value의
12.
타입이
13.
모두
14.
달라도
15.
됨 13년 7월 27일
토요일
16.
Map - create •val
17.
scores
18.
=
19.
Map(“Alice”-10,
20.
“BoB”-12) •val
21.
scores
22.
=
23.
Map((“Alice”,10),
24.
(“BoB”,12)) •val
25.
scores
26.
=
27.
scala.collection.mutable.MapMap(“Alice”-10,
28.
“BoB”-12) •val
29.
scores
30.
=
31.
new
32.
scala.collection.mutable.HashMap[String,
33.
Any]
34.
Map - get •Get •var
35.
aScore
36.
37.
=
38.
scores(“a”) •var
39.
aScore
40.
=
41.
scores.apply(“a”) •Check
42.
Method •var
43.
aScore
44.
=
45.
if
46.
(scores.contains.(“a”))
47.
scores(“a”)
48.
else
49.
0 •var
50.
aScore
51.
=
52.
scores.getOrElse(“a”,0) val
53.
scores
54.
=
55.
Map(“a”-1,
56.
“b”-2,
57.
“c”-3) 13년 7월 27일
토요일
58.
Map - update •scores(“a”)
59.
=
60.
2 •scores
61.
+=
62.
(“a”-10,
63.
“d”-4,
64.
“e”-5) •scores
65.
-=
66.
“a” •val
67.
newScores
68.
=
69.
scores
70.
+
71.
(“d”-4,
72.
“e”-5) val
73.
scores
74.
=
75.
Map(“a”-1,
76.
“b”-2,
77.
“c”-3) 13년 7월 27일
토요일
78.
Map - iterate •Default •for((k,v)
79.
-
80.
scores)
81.
process
82.
k
83.
and
84.
v
85.
•Reverse •for((k,v)
86.
-
87.
scores)
88.
yield(v,k)
89.
•Others •scores.keys
90.
=
91.
scores.keySet
92.
93.
=
94.
Iterable[String]
95.
=
96.
Set(a,
97.
b,
98.
c) val
99.
scores
100.
=
101.
Map(“a”-1,
102.
“b”-2,
103.
“c”-3) 13년 7월 27일
토요일
104.
Map - java
conversions •Scala
105.
-
106.
Java •import
107.
scala.collection.JavaConversions.mapAsScalaMap •val
108.
scores:
109.
scala.collection.mutable.Map[String,
110.
Int]
111.
=
112.
new
113.
java.util.TreeMap[String,
114.
Int] val
115.
scores
116.
=
117.
Map(“a”-1,
118.
“b”-2,
119.
“c”-3) 13년 7월 27일
토요일
120.
Tuple • Tuple • create,
get • iterate 13년 7월 27일 토요일
121.
Tuple •서로
122.
다른
123.
타입의
124.
값들을
125.
가진
126.
집합 •시작
127.
위치가
128.
1 13년 7월 27일
토요일
129.
Map - create •var
130.
tuple
131.
=
132.
(1,
133.
3.14,
134.
“SoMa”) •val
135.
tuple
136.
=
137.
(Map(a-1,b-2),
138.
123) 13년 7월 27일
토요일
139.
Map - get •Get •tuple._1
140.
=
141.
1 •tuple._2
142.
=
143.
3.14 val
144.
tuple
145.
=
146.
(1,
147.
3.14,
148.
“SoMa”) 13년 7월 27일
토요일
149.
Zipping • 값들을 묶어서
한 번에 처리하기 13년 7월 27일 토요일
150.
Zipping - usage •
val symbols = Array(““,“-”,“”) • val counts = Array(2, 10, 2) • var pairs = symbols.zip(counts) = Array[(String, Int)] = Array((,2), (-,10), (,2)) • for((s,n) - c) print(s*n) = ---------- 13년 7월 27일 토요일
151.
Java개발자를 위한.. • http://docs.scala-lang.org/ko/tutorials/scala- for-java-programmers.html 13년
7월 27일 토요일
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