回答編集履歴
1
banana
answer
CHANGED
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@@ -5,6 +5,18 @@
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5
5
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"apple": 100,
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6
6
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"orange": 200,
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7
7
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]
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8
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-
print(Array(a.keys)) //["apple", "orange"]
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8
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+
print(Array(a.keys)) //=> ["apple", "orange"]
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9
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-
print(a.keys.map {$0}) //["apple", "orange"]
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9
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+
print(a.keys.map {$0}) //=> ["apple", "orange"]
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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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+
# valueからkey取得
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13
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+
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14
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+
```swift
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15
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let a = [
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16
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"apple": 100,
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17
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"orange": 200,
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18
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"banana": 100,
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19
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]
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20
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print(Array(a.filter {$0.value == 100}.keys))
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21
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//=> ["banana", "apple"]
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10
22
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```
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