回答編集履歴
5
備考
test
CHANGED
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@@ -8,11 +8,9 @@
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8
8
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9
9
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10
10
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11
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-
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11
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+
- [Rubyの array.map(&:to_s) 記法を紐解く - Qiita](https://qiita.com/kenzan100/items/6344766167299b9f7e91)
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12
12
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13
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-
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14
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-
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15
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-
- [
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13
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+
- [&演算子と、procと、Object#method について理解しなおす - Qiita](https://qiita.com/kasei-san/items/0392097791d3a5998216)
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16
14
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17
15
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- [What are :+ and &:+ in Ruby? - Stack Overflow](https://stackoverflow.com/questions/2697024/what-are-and-in-ruby)
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18
16
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@@ -29,3 +27,9 @@
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29
27
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puts gets.split.map{|v| v.to_i}.reduce{|a, b| a + b}
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30
28
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31
29
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```
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30
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+
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31
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+
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32
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+
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33
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+
- [inject (Enumerable) - Rubyリファレンス](https://ref.xaio.jp/ruby/classes/enumerable/inject) (reduceの別名，個人的にはreduceのほうが好き)
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34
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+
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35
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+
- [map, map! (Array) - Rubyリファレンス](https://ref.xaio.jp/ruby/classes/array/map)
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4
補足
test
CHANGED
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@@ -15,3 +15,17 @@
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15
15
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- [Rubyの array.map(&:to_s) 記法を紐解く - Qiita](https://qiita.com/kenzan100/items/6344766167299b9f7e91)
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16
16
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17
17
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- [What are :+ and &:+ in Ruby? - Stack Overflow](https://stackoverflow.com/questions/2697024/what-are-and-in-ruby)
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18
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+
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19
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+
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20
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+
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21
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+
これと等価です↓
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22
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+
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23
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+
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24
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+
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25
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+
```ruby
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26
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+
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27
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+
puts "数字を入力してください ※空白で区切る"
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28
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+
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29
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+
puts gets.split.map{|v| v.to_i}.reduce{|a, b| a + b}
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30
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+
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31
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+
```
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3
備考2
test
CHANGED
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@@ -8,4 +8,10 @@
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8
8
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9
9
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10
10
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11
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+
備考:
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12
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+
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13
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+
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14
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+
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11
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-
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15
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+
- [Rubyの array.map(&:to_s) 記法を紐解く - Qiita](https://qiita.com/kenzan100/items/6344766167299b9f7e91)
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16
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+
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17
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+
- [What are :+ and &:+ in Ruby? - Stack Overflow](https://stackoverflow.com/questions/2697024/what-are-and-in-ruby)
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2
備考
test
CHANGED
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@@ -5,3 +5,7 @@
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5
5
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puts gets.split.map(&:to_i).reduce(:+)
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6
6
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7
7
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```
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8
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+
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9
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+
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10
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+
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11
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+
備考: [Rubyの array.map(&:to_s) 記法を紐解く - Qiita](https://qiita.com/kenzan100/items/6344766167299b9f7e91)
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1
修正
test
CHANGED
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@@ -2,6 +2,6 @@
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2
2
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3
3
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puts "数字を入力してください ※空白で区切る"
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4
4
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5
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-
puts gets.split.map(&:to_i).
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5
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+
puts gets.split.map(&:to_i).reduce(:+)
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6
6
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7
7
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```
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