Suggest an editImprove this articleRefine the answer for “How does Builder differ from Chain of Responsibility?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Builder** and **Chain of Responsibility** are two completely different patterns, even though both use a step-by-step or sequential approach: the difference is in the goal and the nature of the interaction between objects. **Key point:** Builder answers the question "How to build it step by step?", Chain of Responsibility answers "Who will handle it?".Shown above the full answer for quick recall.Answer (EN)Image**Builder** and **Chain of Responsibility** are two completely different patterns, even though both use a step-by-step or sequential approach. The difference is in the **goal** and the **nature of the interaction between objects**. --- ### 1. **Goal** - **Builder** - controls the **creation of a complex object** from separate parts. It assembles the product step by step until a finished instance is produced. - **Chain of Responsibility** - controls **handling a request**: it passes it along a chain of objects until one of them handles it. --- ### 2. **Type of interaction** - In **Builder**, all steps run **in a defined sequence**, often under the control of a "director." Each step **adds a part** of the future object. - In **Chain of Responsibility**, objects form a **chain**; each one can **handle the request or pass it on**. Here the interaction is **dynamic and conditional**, not a linear construction of a result. --- ### 3. **Context of use** | Criterion | Builder | Chain of Responsibility | |---|---|---| | Goal | Create an object | Handle a request | | Result | One finished object | Potentially different handlers | | Control | A defined order of steps | Dynamic passing along the chain | | Object relationship | Builder and director | Several handlers in a chain | --- ### 4. **Example** **Builder:** Assembles a `Car`: engine -> wheels -> interior -> `build()`. **Chain of Responsibility:** Handles a user request: logger -> authorization -> validation -> controller, until someone completes the chain. --- ### 5. **Conclusion** - **Builder** is about **construction** (creating a product). - **Chain of Responsibility** is about **delegation** (passing a request on). Builder answers the question *"How to build it step by step?"*, Chain of Responsibility answers *"Who will handle it?"*.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.