Grokking Design Patterns for Engineers and Managers
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Prototype Pattern

The Prototype Pattern creates a new object by copying one that is already configured, instead of building it from nothing.

Producing a fresh object is sometimes expensive. The setup reads a file, queries a database, parses a template, or applies forty defaults. If an object already exists in exactly the right shape, constructing another from scratch repeats all that work for no reason.

Consider a NotificationTemplate parsed from disk at start-up. Every welcome email is that template with the subject changed and a channel added

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