Which of the following is the correct way to define a Memento class in Python to store a state string?

easy🧠 Conceptual Q3 of 15

LLD - Behavioral Design Patterns — Part 2

Aclass Memento: def __save__(self, state): self._state = state

Bclass Memento: def __init__(self, state): self._state = state

Cclass Memento: def __init__(self): self.state = None

Dclass Memento: def save(self, state): self.state = state

Step-by-Step Solution

Solution:

Step 1: Understand Memento class structure
The Memento class should have an initializer that accepts the state and stores it privately.
Step 2: Check options for correct syntax and encapsulation
class Memento: def __init__(self, state): self._state = state correctly defines __init__ with a private variable _state. Others either use wrong method names or do not initialize state properly.
Final Answer:
class Memento:\n def __init__(self, state):\n self._state = state -> Option B
Quick Check:
Correct Memento init = class Memento: def __init__(self, state): self._state = state [OK]

Quick Trick: Use __init__ to set private state in Memento [OK]

Common Mistakes:

MISTAKES

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