To clone an object, a constructor must exist to instantiate the first object. This UML describes how a prototype interface is used to clone concrete implementations. If another process needs to use this object, instead of having to perform this substantial database operation, it would be advantageous to clone the previously created object. One use case of the prototype pattern is performing an extensive database operation to create an object used for other parts of the application. The objects created are clones (shallow clones) of the original object that are passed around. The prototype model is used mainly for creating objects in performance-intensive situations. The Prototype design pattern relies on the JavaScript prototypical inheritance.

For the full set, see JavaScript Design Patterns.Īny JavaScript developer has either seen the keyword prototype, confused by the prototypical inheritance, or implemented prototypes in their code. The design pattern below is only one of many useful patterns that can help you level up as a JavaScript developer.

Design patterns prove crucial to solving this challenge - providing an organization structure for common issues in a particular circumstance. Code structuring becomes more important as applications become larger. Every developer strives to write maintainable, readable, and reusable code.

Javascript prototype