回答編集履歴
2
改行前にカンマを追加
answer
CHANGED
|
@@ -13,7 +13,7 @@
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|
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13
13
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let a = [0, 2, 3, 1, 2, 3, 2, 5, 26, 23]
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14
14
|
|
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15
15
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zip(a, ThreeCount()).forEach {
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16
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-
print($0.0, terminator: $0.1 ? "\n" : ",")
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16
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+
print($0.0, terminator: $0.1 ? ",\n" : ",")
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17
17
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}
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18
18
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print("")
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19
19
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```
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1
SequenceのElementをBoolにすることで無駄な処理をなくした
answer
CHANGED
|
@@ -3,20 +3,17 @@
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3
3
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```swift
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4
4
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struct ThreeCount: Sequence, IteratorProtocol {
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5
5
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var current = 0
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6
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-
mutating func next() ->
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6
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+
mutating func next() -> Bool? {
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7
7
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let res = current
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8
8
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current = (current + 1) % 3
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9
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-
return res
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|
9
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+
return res == 2
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|
10
10
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}
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11
11
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}
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12
12
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|
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13
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-
func isThree(_ val: Int) -> Bool { return val == 3 }
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|
14
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-
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|
15
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-
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16
13
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let a = [0, 2, 3, 1, 2, 3, 2, 5, 26, 23]
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17
14
|
|
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18
15
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zip(a, ThreeCount()).forEach {
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19
|
-
print($0.0, terminator:
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|
16
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+
print($0.0, terminator: $0.1 ? "\n" : ",")
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|
20
17
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}
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|
21
18
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print("")
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|
22
19
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```
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