[Solved] What is wrong with this Visitor pattern code snippet?class ElementA { accept(visitor) { visitor.visitElementA(); } } class Visitor { visitElementA(element) { console.log('Visited A'); } } | LLD

LLD - Behavioral Design Patterns — Part 2

What is wrong with this Visitor pattern code snippet?

class ElementA {
  accept(visitor) {
    visitor.visitElementA();
  }
}

class Visitor {
  visitElementA(element) {
    console.log('Visited A');
  }
}

AVisitor method should not take parameters

Baccept does not pass element to visitor method

Caccept should return a value

DVisitor class should be abstract

Step-by-Step Solution

Solution:

Step 1: Check accept method call
accept calls visitor.visitElementA() without passing 'this' element.
Step 2: Verify visitor method signature
visitElementA expects an element parameter, but none is passed.
Final Answer:
accept does not pass element to visitor method -> Option B
Quick Check:
Visitor method needs element argument [OK]

Quick Trick: Visitor methods usually require element parameter [OK]

Common Mistakes:

MISTAKES

Thinking visitor methods take no parameters
Assuming accept must return value
Believing Visitor must be abstract

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What is wrong with this Visitor pattern code snippet?

Step 1: Check accept method call

Step 2: Verify visitor method signature

Final Answer:

Quick Check:

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