The Builder Pattern

The Problem

Some objects have many optional properties and complex construction logic. A factory with Partial<T> works for simple cases, but when construction involves multiple steps or conditional logic, a Builder provides a cleaner API.

// Hard to read: what do these parameters mean?
const request = createRequest("POST", "/api/users", headers, body, 10000, true);

// Builder: self-documenting
const request = new RequestBuilder()
  .setMethod("POST")
  .setUr...