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var gameTitle = function(game){}

gameTitle.prototype = {
  create: function(){}

It's a JS pattern to add class-like behaviour into a prototypal language, if you know what classes are (in Java, C++ etc for example) then its pretty akin to that. The top function call is a constructor function, the prototype bit adds methods (behaviours) to your class. You should just call this an object as JS doesn't have traditional classes (despite the new class syntax).

The way you're doing it though stamps over any existing methods on the prototype, this is generally bad, sometimes very bad.

Extending the checkout with additional functionality is fine but be careful stamping over it, particularly if you're setting up some sort of inheritance chain.

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