singleton-pattern

Singleton Pattern

This pattern lets us use an object uniquely in the platform. It should be valid for configurations. In Ruby we could apply to a class behavior of singleton defining some variable like class vars.

In this example, we have Invoice that have the property total_line_concept shared between any instance of invoice.

classDiagram
    Invoice

    class Invoice{
        @@total_line_concepts
        add_total_amount
        self.show_total_line_concepts
    }

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Try it

In your console execute:

ruby singleton-pattern/working-example/example.rb