回答編集履歴
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miss!
answer
CHANGED
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@@ -1,4 +1,9 @@
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1
1
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# 頭の体操
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2
2
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3
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+
```swift
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3
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-
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4
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+
print(areas.filter {$0["name"] == "東京"}.flatMap {Int($0["code"] ?? "")}.reduce(0, +))
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5
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//=> 43
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6
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+
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4
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-
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7
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print(areas.filter {$0["name"] == "東京"}.reduce(0) {$0 + (Int($1["code"] ?? "") ?? 0)})
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8
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//=> 43
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9
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```
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