回答編集履歴
1
miss!
test
CHANGED
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@@ -2,6 +2,16 @@
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2
2
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3
3
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4
4
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5
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-
```swift
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5
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+
```swift
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6
6
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7
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+
print(areas.filter {$0["name"] == "東京"}.flatMap {Int($0["code"] ?? "")}.reduce(0, +))
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8
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+
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9
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//=> 43
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10
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+
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11
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+
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12
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+
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7
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-
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13
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+
print(areas.filter {$0["name"] == "東京"}.reduce(0) {$0 + (Int($1["code"] ?? "") ?? 0)})
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14
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+
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15
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+
//=> 43
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16
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+
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17
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```
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