[Solved] Consider a Composite structure where a composite node contains two leaf nodes labeled 'X'... If you use a depth-first iterator to traverse this composite, what will be the sequence of visited nodes? | OOP & Design Patterns

OOP & Design Patterns - Iterator & Composite Pattern - Traversal Abstractions

Consider a Composite structure where a composite node contains two leaf nodes labeled 'X' and 'Y'. If you use a depth-first iterator to traverse this composite, what will be the sequence of visited nodes?

AComposite, X, Y

BX, Y, Composite

CY, X, Composite

DComposite, Y, X

Step-by-Step Solution

Solution:

Step 1: Understand traversal order
Depth-first traversal visits the composite node first, then its children.
Step 2: Apply to given structure
The composite is visited first, followed by leaf 'X', then leaf 'Y'.
Final Answer:
Option A -> Option A
Quick Check:
Traversal order matches depth-first pre-order [OK]

Quick Trick: Depth-first pre-order visits parent before children [OK]

Common Mistakes:

MISTAKES

Assuming leaves are visited before the composite
Confusing depth-first with breadth-first traversal

Trap Explanation:

PITFALL

Thinking traversal visits leaves before the composite node

Interviewer Note:

CONTEXT

Tests understanding of traversal order in composite iterators

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More OOP & Design Patterns Quizzes

If you use a depth-first iterator to traverse this composite, what will be the sequence of visited nodes?

Step 1: Understand traversal order

Step 2: Apply to given structure

Final Answer:

Quick Check:

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