Builder Design Pattern Explained

Builder separates the construction of a complex object from its representation, letting the same construction process create different configurations.

Why it exists

• Objects with many optional constructor parameters lead to unwieldy constructors or a combinatorial explosion of overloads

How to apply it

• Create a builder class with chained methods for setting each optional property, ending with a build() method that returns the finished object
• This produces readable, self-documenting object construction code compared to a constructor with many positional arguments

FAQ

Is a fluent API the same as the Builder pattern?

A fluent, method-chaining API is a common way to implement Builder, but "fluent interface" more broadly just describes any chainable method style.