The Builder Pattern Basics
Construct complex objects step by step.
Why a Builder?
Some objects need many fields, and constructing them with a giant constructor full of positional arguments is error-prone. The Builder pattern constructs a complex object step by step, one named call at a time.
The Object We Want
Imagine an HTTP request with a url, method, headers, and body. Passing all of these to one constructor is hard to read. A builder lets us set each piece with a clearly named method.
interface HttpRequest {
url: string;
method: string;
headers: Record<string, string>;
body?: string;
}All lessons in this course
- The Builder Pattern Basics
- Fluent Interfaces with Types
- Enforcing Required Steps
- Immutable Builders