Created
September 16, 2017 13:23
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| class Database | |
| @@instance = Database.new | |
| def self.instance | |
| return @@instance | |
| end | |
| private_class_method :new | |
| end | |
| d1 = Database.instance | |
| d2 = Database.instance | |
| d2.object_id == d1.object_id # true |
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