LLD

Here's a flow diagram illustrating an effective approach to tackling Low-Level Design (LLD) problems in interviews. This diagram highlights each key step in a visual format for quick reference:

           +------------------------------+
           |  Start: Clarify Requirements |
           +------------------------------+
                        |
                        v
           +-----------------------------+
           | Define User Flow and        |
           | System Interactions         |
           +-----------------------------+
                        |
                        v
           +-----------------------------+
           | Identify Key Components and |
           | Determine Relationships     |
           +-----------------------------+
                        |
                        v
           +-----------------------------+
           | Create UML Class Diagram    |
           | with Relationships          |
           +-----------------------------+
                        |
                        v
           +-----------------------------+
           | Define Classes, Attributes, |
           | and Core Methods            |
           +-----------------------------+
                        |
                        v
           +-----------------------------+
           | Handle Edge Cases and       |
           | Error Scenarios             |
           +-----------------------------+
                        |
                        v
           +-----------------------------+
           | Plan for Extensibility and  |
           | Scalability                 |
           +-----------------------------+
                        |
                        v
           +-----------------------------+
           | (Optional) Show Sample      |
           | Code for Key Methods        |
           +-----------------------------+
                        |
                        v
           +-----------------------------+
           |     End: Review and         |
           |     Adjust if Needed        |
           +-----------------------------+

Quick Guide to Approach LLD Interviews

1. Clarify Requirements

   • Ask questions to ensure a full understanding of core features and constraints.

   • Confirm any assumptions about the requirements.

2. Define the Flow

   • Outline the end-to-end flow of how the system will operate.

   • Discuss key user actions and system responses (e.g., for a scheduler, booking a meeting).

3. Identify Key Components

   • List the primary components needed and their responsibilities.

   • Think about relationships (e.g., composition, inheritance) between these components.

4. Draw the UML Diagram

   • Create a simple UML class diagram showing key classes, attributes, and methods.

   • Focus on representing relationships, such as associations and dependencies.

5. Define Classes and Methods

   • Translate the UML into code-like structures with class names, attributes, and methods.

   • Briefly describe each method's purpose without full implementation details.

6. Handle Edge Cases

   • Discuss edge cases and how your design will handle failures (e.g., invalid moves, scheduling conflicts).

7. Plan for Extensibility

   • Mention any future scalability options or how your design can handle added features (e.g., recurring meetings).

8. Show Sample Code (Optional)

   • If time allows, write one or two critical methods to demonstrate coding skills.

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Key Tips

• Communicate Clearly: Explain each step as you go.

• Focus on Core Concepts: Highlight OOP principles.

• Be Open to Feedback: Adjust your approach if the interviewer suggests changes.