Iterator Design Pattern | UML + Code | System Design
Welcome to Lecture 29 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 implement the Iterator Pattern from scratch in C++ / Java to decouple traversal logic from data structures—making your code cleaner, more extensible, and true to Low-Level Design principles.
What You’ll Learn
Defining a generic Iterator T and Iterable T interface
Building a LinkedListIterator for sequential access
Creating an Inorder Iterator for binary trees using a stack
Implementing a PlaylistIterator to traverse collections of custom objects
Attaching iterators to classes so clients can loop uniformly over any structure
When and why to use the Iterator Pattern in real-world systems
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00:00 Introduction
00:49 Iterating on Objects
03:28 Why do we need Iterators
14:37 Example for Iterator Pattern
15:04 UML for Example
24:08 Clean UML
26:50 Code foe Iterator Pattern
36:29 Standard UML
37:06 Standard Definition
38:19 Further Extensions
39:25 Real world use caseder
01:47:28 Standard Definition
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