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The singleton is a design pattern to ensure that exactly one application-wide instance of a particular class exists.

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Javascript singleton to notify different objects of changes in viewport size

I'm working on a singleton object to manage size changes in the viewport, I wanted it to be a singleton because there may be different unrelated objects that need to be notified when a change in viewport … So I came up with this solution based on the singleton design pattern found in here. …
Eduardo E. Valenzuela's user avatar