System Design Full Course - Builder Design Pattern | Classic Builder | Step Builder | UML + Code | System Design

Welcome to Lecture 28 of the Ultimate Low-Level Design (LLD) Series by Coder Army! Sixth week for #lowleveldesign #systemdesign #8weeksLLdchallenge. We are doing 8 weeks challenge and going to complete the whole course within the duration with quality content on Youtube. Let’s learn LLD like never before and attain advance level mastery on this subject. In this video, we’ll explore three flavors of the *Builder Pattern* in C++: 1. *Classic Builder* – a nested builder for HttpRequest BuilderPattern 2. *Builder with Director* – encapsulating common configurations BuilderWithDirector 3. *Step Builder* – enforcing build steps via interfaces StepBuilder You’ll learn how to: - Separate construction from representation for complex objects - Enforce required vs. optional parameters at compile time - Use a *Director* to standardize common builds - Prevent invalid states with a *Step Builder* - Keep your API fluent, readable, and type-safe Join Coder Army Whatsapp Group: https://whatsapp.com/channel/0029Va6H0tbHVvTbcuT99Y1f Code and Notes: Github : https://github.com/adityatandon15/LLD Connect with Aditya Tandon Instagram : https://www.instagram.com/adityatandon2 LinkedIn : https://www.linkedin.com/in/adityatandon2 Twitter : https://x.com/adityatandon02 00:00 Introduction 03:43 Why do we need Builder Pattern 07:01 Problems Without Builder Implementation 07:20 Problem 1 : Constructor Telescoping 12:47 Problem 2 : Immutable Objects 15:56 Problem 3: Inconsistent State Problem 21:38 Problem 4: Scattered Validations 24:44 Code for Bad Design 29:47 Introducing Simple Builder 35:11 Code for Simple Builder 58:43 Diagram for analysing Builder pattern 01:03:56 UML Diagram for Simple Builder 01:05:01 Builder with Director 01:06:56 Code for Builder with Director 01:11:58 Step Builder 01:16:33 Multiple Inheritance in Step Builder 01:19:07 How step builder works 01:36:34 Code for Step Builder 01:46:29 UML for Director & Step Builder 01:47:28 Standard Definition #SystemDesign #LowLevelDesign #LLD #AdapterPattern #DesignPatterns #Cplusplus #JavaDevelopers #UMLDiagrams #TechInterviews #SoftwareEngineering #XMLtoJSON #CleanCode #SoftwareArchitecture #ObjectOrientedDesign #CodingWithExamples #CodeBetter #8WeeksLLDChallenge #JSON