回答編集履歴
2
update test
answer
CHANGED
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@@ -23,4 +23,23 @@
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23
23
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}
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24
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}
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25
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print("numberOfMessages =", numberOfMessages)
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26
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+
```
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27
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+
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28
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+
# test（修正版）
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29
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30
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```swift
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31
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var countRead = 0, countUnread = 0, countNil = 0
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32
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news.enumerated().forEach {
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33
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print($0, $1.listened ?? "nil")
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34
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if let listened = $1.listened {
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35
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if listened {
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countRead += 1
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37
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} else {
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38
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countUnread += 1
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}
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} else {
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countNil += 1
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}
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}
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print("count:(news.count) read:(countRead) unread:(countUnread) nil:(countNil)")
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26
45
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```
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1
test
answer
CHANGED
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@@ -8,4 +8,19 @@
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8
8
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9
9
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```swift
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10
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news.filter {$0.listened == false}.count
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11
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```
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12
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13
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# test
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14
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15
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```swift
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16
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var numberOfMessages = 0
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17
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news.enumerated().forEach {
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18
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print($0, $1.listened ?? "nil")
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19
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if let listened = $1.listened {
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20
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if listened {
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21
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numberOfMessages += 1
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22
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}
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23
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}
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24
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}
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25
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print("numberOfMessages =", numberOfMessages)
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11
26
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```
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