# Factory Pattern

> A design pattern that moves the construction of an object and its defaults into one function or object.

Record: `architecture:factory-pattern`
Kind: pattern
Layer: [Design Patterns Core](https://banes-lab.com/records/layer/design-patterns-core.md)
Severity: recommended
Scope: object_creation, module
Canonical: https://banes-lab.com/ontology#architecture-factory-pattern

Listed in [Architecture principles](https://banes-lab.com/api/records/architecture.md), after [Statecharts](https://banes-lab.com/records/architecture/statecharts.md) and before [Factory Method Pattern](https://banes-lab.com/records/architecture/factory-method-pattern.md).

## Repair

- Refactored by: Extract Factory
- Detected by: repeated constructors/switches
- Violated by: duplicated conditional construction
- Measured by: construction duplication count
- Enforced by: creation policy review

## Requires

- [Creation Variation](https://banes-lab.com/records/lexicon/creation-variation.md)

## Reinforces

- [Open/Closed Principle (OCP)](https://banes-lab.com/records/architecture/open-closed.md)
- [Encapsulation](https://banes-lab.com/records/architecture/encapsulation.md)

## Enables

- [Polymorphic Construction](https://banes-lab.com/records/lexicon/polymorphic-construction.md)

## Conflicts with

- [Scattered Construction Logic](https://banes-lab.com/records/lexicon/scattered-construction-logic.md)

## In tension with

- [Simplicity](https://banes-lab.com/records/lexicon/simplicity.md)

## Tensions

- [Factory Pattern / Simplicity](https://banes-lab.com/records/tension/factory-pattern-simplicity.md)

## Severity

- [recommended](https://banes-lab.com/records/vocabulary/severity-recommended.md)

## Category

- [Creational Patterns](https://banes-lab.com/records/architecture-category/creational-patterns.md)

## Force

- [Object creation](https://banes-lab.com/records/force/object-creation.md)

## Enforced by

- [rules/eslint/factory-owned-value.eslint.rule.ts](https://banes-lab.com/source/governance/rules/eslint/factory-owned-value.eslint.rule.ts.md)
- [rules/eslint/no-raw-dom.eslint.rule.ts](https://banes-lab.com/source/governance/rules/eslint/no-raw-dom.eslint.rule.ts.md)

## Reinforced by

- [Registry Pattern](https://banes-lab.com/records/architecture/registry-pattern.md)

## Linked from

- [Core Modular Design](https://banes-lab.com/ontology/principles/architecture-category-core-modular-design.md)
- [SOLID / Object-Oriented Design](https://banes-lab.com/ontology/principles/architecture-category-solid-object-oriented-design.md)
- [Plugin / Extensibility / IoC](https://banes-lab.com/ontology/principles/architecture-category-plugin-extensibility-ioc.md)
- [Creational Patterns](https://banes-lab.com/ontology/lexicon/lexicon-category-creational-patterns.md)
- [Quality Attributes](https://banes-lab.com/ontology/lexicon/lexicon-category-quality-attributes.md)
- [Severity levels](https://banes-lab.com/ontology/schema/the-vocabulary-severity.md)
- [The forces](https://banes-lab.com/ontology/schema/the-forces.md)
- [The resolutions](https://banes-lab.com/ontology/schema/the-resolutions.md)