回答編集履歴
2
update test
test
CHANGED
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@@ -49,3 +49,41 @@
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49
49
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print("numberOfMessages =", numberOfMessages)
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50
50
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51
51
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```
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52
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+
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53
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54
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55
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# test（修正版）
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56
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57
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58
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59
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```swift
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60
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61
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var countRead = 0, countUnread = 0, countNil = 0
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62
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63
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news.enumerated().forEach {
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64
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65
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print($0, $1.listened ?? "nil")
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66
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67
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if let listened = $1.listened {
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68
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69
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if listened {
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70
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71
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countRead += 1
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72
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73
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} else {
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74
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75
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countUnread += 1
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76
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77
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}
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78
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79
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} else {
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80
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81
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countNil += 1
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82
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83
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}
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84
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85
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}
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86
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87
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print("count:(news.count) read:(countRead) unread:(countUnread) nil:(countNil)")
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88
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89
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```
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1
test
test
CHANGED
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@@ -19,3 +19,33 @@
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19
19
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news.filter {$0.listened == false}.count
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20
20
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21
21
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```
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22
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23
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24
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25
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# test
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26
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27
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28
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29
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```swift
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30
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31
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var numberOfMessages = 0
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32
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33
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news.enumerated().forEach {
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34
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35
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print($0, $1.listened ?? "nil")
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36
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37
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if let listened = $1.listened {
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38
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39
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if listened {
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40
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41
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numberOfMessages += 1
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42
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43
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}
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44
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45
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}
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46
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47
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}
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48
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49
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print("numberOfMessages =", numberOfMessages)
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50
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51
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```
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