Creational Design Patterns
Patterns for object creation: Singleton, Factory Method, Abstract Factory, Builder, and Prototype with intents and use cases.
Creational design patterns that control how objects are created: Singleton, Factory Method, Abstract Factory, Builder and Prototype, plus Object Pool, Lazy Initialization and Dependency Injection, each with intent and when to use it.
Use it when
- You need to decouple code from the concrete classes it instantiates.
- You are choosing among factory-style patterns.
Watch out for
- Singleton is often overused and acts as hidden global state; dependency injection is usually a better alternative.
- Dependency injection is a technique rather than a Gang of Four pattern, listed here because it addresses the same problem.
The data
Patterns
8 rows
| Name | Intent | When to use |
|---|---|---|
| Singleton | Ensure a class has only one instance | Shared resource access, global state |
| Factory Method | Create objects without specifying exact class | Decoupling object creation from usage |
| Abstract Factory | Create families of related objects | Multiple product variants |
| Builder | Construct complex objects step by step | Many configuration options |
| Prototype | Create new objects by copying existing ones | Object creation is costly |
| Object Pool | Reuse a set of expensive-to-create objects instead of creating and destroying them on demand | Database connections, threads and other costly resources |
| Lazy Initialization | Delay creating an object or computing a value until it is first needed | Expensive objects that may never be used |
| Dependency Injection | Supply an object's dependencies from outside instead of letting it construct them | Testing, configuration and swapping implementations without changing callers |
Fields
The shape of this dataset, read from the data itself: every column, its type and a real value. Agents can use this to plan a query without fetching the whole document.
| Section | Field | Type | Example |
|---|---|---|---|
| patterns | name | string | Singleton |
| patterns | intent | string | Ensure a class has only one instance |
| patterns | when_to_use | string | Shared resource access, global state |
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