LLDbeginner
Builder Pattern
Builder is useful when objects have many optional parameters or require step-by-step construction. It improves readability and often pairs naturally with immutability.
Reading time
8 min
builderpatternsimmutabilityapi design
Why Builder Helps
Large constructors are hard to read and easy to misuse. Builders make intent explicit and avoid constructor overloads.
Common Use Cases
- Request objects
- Configuration-heavy services
- Immutable domain objects
- DTOs with optional fields
Benefits
- Fluent APIs
- Easier validation before object creation
- Cleaner client code
Interview Tip
When you see many optional fields, builder is often the cleanest design choice.