質問編集履歴
1
テストコードの出力結果を追記しました。
title
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File without changes
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body
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@@ -78,4 +78,41 @@
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78
78
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let numberOfMessages: Int = news.filter{ (key: String, value: Bool) -> Bool in return key == "listened" || value == false}.count
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79
79
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```
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80
80
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81
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-
Contextual closure type '(New2) -> Bool' expects 1 argument, but 2 were used in closure body
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81
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+
Contextual closure type '(New2) -> Bool' expects 1 argument, but 2 were used in closure body
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82
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+
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83
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------------------------------------------------------
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84
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以下10/6追加
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85
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+
```Swift
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86
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+
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87
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var numberOfMessages: Int = news.filter {$0.listened == false}.count
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88
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news.enumerated().forEach {
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89
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print($0, $1.listened ?? "nil")
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90
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if let listened = $1.listened {
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91
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if listened {
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92
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numberOfMessages += 1
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93
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}
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94
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}
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95
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}
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96
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print("numberOfMessages =", numberOfMessages)
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97
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```
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98
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こちらの出力が、
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99
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0 false
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100
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numberOfMessages = 1
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101
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```Swift
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102
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//var numberOfMessages: Int = news.filter {$0.listened == false}.count
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103
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var numberOfMessages = 0
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104
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news.enumerated().forEach {
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105
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print($0, $1.listened ?? "nil")
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106
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if let listened = $1.listened {
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107
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if listened {
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108
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numberOfMessages += 1
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109
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}
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110
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}
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111
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}
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112
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print("numberOfMessages =", numberOfMessages)
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113
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```
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114
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こちらの出力が、
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115
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0 false
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116
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numberOfMessages = 0
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117
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+
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118
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です。両者とも、開いていないメッセージ（listened = false）が複数ある状態です。
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