Working with objects — Defining properties for all objects of one type
You can add a property to all objects created through a certain constructor using the prototype property.
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You can add a property to all objects created through a certain constructor using the prototype property. This defines a property that is shared by all objects of the specified type, rather than by just one instance of the object. The following code adds a color property to all objects of type Car, and then reads the property's value from an instance car1.
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MDN Web Docs — files/en-us/web/javascript/guide/working_with_objects/index.md :: Defining properties for all objects of one type ↗Revision d14bee540b53 · CC-BY-SA-2.5