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。
test
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File without changes
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test
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@@ -159,3 +159,77 @@
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159
159
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160
160
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161
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Contextual closure type '(New2) -> Bool' expects 1 argument, but 2 were used in closure body
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162
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163
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164
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165
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------------------------------------------------------
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166
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167
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以下10/6追加
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168
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169
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```Swift
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170
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171
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172
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173
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var numberOfMessages: Int = news.filter {$0.listened == false}.count
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174
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175
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news.enumerated().forEach {
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176
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177
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print($0, $1.listened ?? "nil")
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178
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179
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if let listened = $1.listened {
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180
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181
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if listened {
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182
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183
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numberOfMessages += 1
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184
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185
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}
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186
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}
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}
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191
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print("numberOfMessages =", numberOfMessages)
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193
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```
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195
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こちらの出力が、
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0 false
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198
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199
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numberOfMessages = 1
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200
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201
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```Swift
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202
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203
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//var numberOfMessages: Int = news.filter {$0.listened == false}.count
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204
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205
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var numberOfMessages = 0
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206
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207
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news.enumerated().forEach {
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208
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209
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print($0, $1.listened ?? "nil")
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210
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211
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if let listened = $1.listened {
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212
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213
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if listened {
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214
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215
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numberOfMessages += 1
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216
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217
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}
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218
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}
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220
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}
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print("numberOfMessages =", numberOfMessages)
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225
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```
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こちらの出力が、
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228
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0 false
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numberOfMessages = 0
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232
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233
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234
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235
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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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