1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
//############################################################################
// for-comprehensions (old and new syntax)
//############################################################################
//############################################################################
object Test extends App {
val xs = List(1, 2, 3)
val ys = List('a, 'b, 'c)
def it = 0 until 10
val ar = "abc".toCharArray
/////////////////// old syntax ///////////////////
def testOld {
println("\ntestOld")
// lists
for (x <- xs) print(x + " "); println
for (x <- xs;
if x % 2 == 0) print(x + " "); println
for {x <- xs
if x % 2 == 0} print(x + " "); println
var n = 0
for (_ <- xs) n += 1; println(n)
for ((x, y) <- xs zip ys) print(x + " "); println
for (p @ (x, y) <- xs zip ys) print(p._1 + " "); println
// iterators
for (x <- it) print(x + " "); println
for (x <- it;
if x % 2 == 0) print(x + " "); println
for {x <- it
if x % 2 == 0} print(x + " "); println
// arrays
for (x <- ar) print(x + " "); println
for (x <- ar;
if x.toInt > 97) print(x + " "); println
for {x <- ar
if x.toInt > 97} print(x + " "); println
}
/////////////////// new syntax ///////////////////
def testNew {
println("\ntestNew")
// lists
var n = 0
for (_ <- xs) n += 1; println(n)
for ((x, y) <- xs zip ys) print(x + " "); println
for (p @ (x, y) <- xs zip ys) print(p._1 + " "); println
// iterators
for (x <- it) print(x + " "); println
for (x <- it if x % 2 == 0) print(x + " "); println
for (x <- it; if x % 2 == 0) print(x + " "); println
for (x <- it;
if x % 2 == 0) print(x + " "); println
for (x <- it
if x % 2 == 0) print(x + " "); println
for {x <- it
if x % 2 == 0} print(x + " "); println
for (x <- it;
y = 2
if x % y == 0) print(x + " "); println
for {x <- it
y = 2
if x % y == 0} print(x + " "); println
// arrays
for (x <- ar) print(x + " "); println
}
////////////////////////////////////////////////////
testOld
testNew
}
|
