Array#sumはRuby2.4から、それより前のバージョンでArray#sumっぽいことがしたい時はArray#injectで代用可能。
[1,2,3,4,5].inject(:+)
#参考
http://rurema.clear-code.com/query:sum/
http://rurema.clear-code.com/2.3.0/method/Enumerable/i/inject.html
More than 5 years have passed since last update.
Register as a new user and use Qiita more conveniently
- You get articles that match your needs
- You can efficiently read back useful information
- You can use dark theme