回答編集履歴
2
バージョンを追記
test
CHANGED
@@ -7,3 +7,7 @@
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7
7
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merged = ary.group_by { |h| h['num'] }.values.map { |hashes| hashes.reduce(&:merge) }
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8
8
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9
9
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```
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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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13
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+
(なお、`Enumerable#group_by`は、Ruby 2.0以降の機能です。)
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1
\.valuesを入れて配列に戻す
test
CHANGED
@@ -4,6 +4,6 @@
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4
4
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5
5
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```ruby
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6
6
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7
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-
merged = ary.group_by { |h| h['num'] }.map { |hashes| hashes.reduce(&:merge) }
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7
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+
merged = ary.group_by { |h| h['num'] }.values.map { |hashes| hashes.reduce(&:merge) }
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8
8
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9
9
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```
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