When is the Prototype pattern used?

The Prototype pattern is used in situations where creating an object from scratch is expensive, complex, or undesirable, and copying an existing instance is faster and simpler.

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#1. When creating an object is too expensive

If an object requires lengthy initialization (for example, reading files, database queries, or loading resources), it is simpler to create it once and then clone it. Example: graphical shapes with textures or 3D models in games, a copy is created instantly instead of being loaded from disk every time.

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#2. When the system must be independent of concrete classes

Client code can work through the Prototype interface without knowing which exact classes it is copying. This lets you add new object types without changing the program's logic.

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#3. When the object already has the configuration you need

Sometimes it is simpler to copy a ready-made template (prototype) than to configure the fields manually from scratch every time. For example, a document form with pre-filled fields that the user then edits.

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#4. When you need to create objects at runtime

If the type of the object to create is unknown until the program runs, but you have an instance of it, you can simply call clone(). This is how, for example, serialization systems, caching, and editors are built, where users create duplicates of elements.

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#5. When you need fast cloning in large structures

Prototype is used for bulk copying of complex object graphs, where standard creation would be too slow.

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Conclusion: Prototype is used when it matters to cut the cost of creation, avoid depending on concrete classes, and flexibly duplicate objects that are already configured, especially in systems where speed, templates, and data reuse play a key role.