LLD - Behavioral Design Patterns — Part 1
Which of the following is the correct way to define a handler class with a next handler in Python for the Chain of Responsibility pattern?
Which of the following is the correct way to define a handler class with a next handler in Python for the Chain of Responsibility pattern?
easy🧠 Conceptual Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct handler initialization
class Handler: def __init__(self): self.next_handler = None def set_next(self, handler): self.next_handler = handler shows a handler with a default next_handler set to None and a method to set the next handler, which is a common and clear approach.Step 2: Compare other options
class Handler: def __init__(self, next_handler=None): self.next_handler = next_handler lacks a method to set next handler after initialization. class Handler: def __init__(self, next_handler): self.next_handler = next_handler def handle(self): pass requires next_handler at init and lacks flexibility. class Handler: def __init__(self): self.next = None def handle(self): pass uses 'next' instead of 'next_handler' and lacks setter method.Final Answer:
class Handler: def __init__(self): self.next_handler = None def set_next(self, handler): self.next_handler = handler -> Option CQuick Check:
Handler class with setter method = class Handler: def __init__(self): self.next_handler = None def set_next(self, handler): self.next_handler = handler [OK]
Quick Trick: Use setter method to link handlers flexibly [OK]
Common Mistakes:
MISTAKES- Forgetting to initialize next handler
- Not providing a method to set next handler
- Using inconsistent attribute names
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